By Local TV Aerials & Satellites – Same-day engineers across East & West Sussex
TV pixelation is one of the most frustrating issues you can have with your home entertainment. You sit down to watch something and suddenly the picture breaks into little blocks, freezes or disappears altogether. The good news is that pixelation nearly always has a clear cause – and when it’s diagnosed properly, it’s usually straightforward to fix.
In this guide, we’ll walk you through the 10 most common causes of TV pixelation and what can be done about each one. This is the same step-by-step process our engineers use on real callouts across Brighton, Hove, Lewes, Seaford, Eastbourne, Worthing, Crawley and the rest of Sussex.
If you’d like an expert to take a look for you, we offer same-day TV aerial and satellite repairs across East Sussex and West Sussex.
Call us on 0800 802 1791.
1. Weak or Unstable Signal Strength
A stable digital TV picture depends on two things: signal strength and signal quality. You can have a fairly strong signal that still pixelates if the quality is poor, and you can have a lower strength signal that is rock-solid if the quality is good.
Pixelation happens when either of these two numbers drops or fluctuates. Common causes of weak or unstable signals include:
- An old or poorly performing aerial
- Water-damaged coaxial cable
- Corroded connectors or wall plates
- Being in a marginal or “fringe” reception area
Sussex has its own quirks: coastal locations and valleys often suffer from reflections and obstructions, so the signal quality can dip even when strength looks acceptable.
What you can check yourself
Most modern TVs have a signal information screen:
- Open your TV menu
- Look for “Signal”, “Signal Information” or “Digital Setup”
- Check both strength and quality
As a rough guide, anything consistently under around 50–60% on either reading can cause break-up and freezing, especially in bad weather.
How we fix weak signals professionally
On a callout, our engineers use a digital signal meter at various points in the system to see exactly where the loss or noise is happening. We test:
- At the aerial itself
- At the masthead or loft amplifier (if fitted)
- At splitters and distribution points
- At the wall plate and TV
Once we know where the problem lies, we can recommend the right solution – anything from a simple cable replacement to a full
new TV aerial installation.
2. Aerial Misalignment from Storms or Coastal Winds
Sussex is no stranger to strong winds, especially along the coast. Over time, storms and gusts can nudge an aerial just a few degrees off its ideal position. Because digital TV signals are highly directional, even a slight knock can lead to frequent pixelation, missing channels or total loss of service.
Common causes of misalignment include:
- Winter storms and high winds
- Loose or rusted aerial brackets
- Seagulls and other birds landing on the aerial
What you can look for
From ground level, compare your aerial to neighbouring properties. Does yours appear:
- Twisted compared with others?
- Dipping down more than it should?
- Pointing a slightly different way?
If so, there’s a good chance misalignment is contributing to your pixelation issues.
How we realign an aerial properly
We don’t just “point and hope”. Our engineers use alignment tools and meters to lock onto the correct transmitter for your property – often Whitehawk Hill, Heathfield or Rowridge, depending on where you live. We then secure brackets and fittings so they can withstand typical coastal conditions.
3. Water Ingress in Cables and Connections
Water getting into coaxial cables and connectors is one of the most common causes of pixelation we see. Outdoor cables and joints are constantly exposed to the elements. If insulation is cracked or connectors aren’t properly weatherproofed, moisture can creep in.
Over time, this causes the copper inside the cable to oxidise. Signal quality gradually worsens and pixelation becomes more frequent, especially during or after rain.
Typical signs of water damage
- Pixelation is noticeably worse in wet or damp weather
- The problem has slowly got worse over months rather than overnight
- Any visible cables look cracked, brittle or discoloured
How we fix it
We identify which cable runs and joints are affected, replace the damaged sections and fully weatherproof all external connections. In many cases, this alone is enough to restore a solid picture.
4. Faulty Splitters, Boosters or Loft Amplifiers
If your aerial feeds several rooms, it probably uses splitters or an amplifier system. These components can deteriorate or fail over time, and if they’re not set up correctly, they can actually make the signal worse instead of better.
Symptoms of a failing distribution system include:
- Pixelation in some rooms but not others
- A booster that once helped but now seems to cause more problems
- A loft amplifier that’s hot to the touch or making noise
- Issues that appeared suddenly after years of clear viewing
How we diagnose and repair
We test the signal before and after each component to see where it drops or becomes noisy. Faulty splitters, overpowered boosters or failing amplifiers can then be replaced or reconfigured. In some cases, a simpler, cleaner setup works much better than a chain of old boosters.
5. 4G/5G Mobile Interference (Increasingly Common)
As mobile networks upgrade to 4G and 5G, more phone masts are appearing – and some of them operate on frequencies very close to TV signals. That can cause interference, especially in busy or built-up areas around Brighton, Hove, Shoreham and Worthing.
Interference often looks like:
- Sudden bursts of pixelation for no obvious reason
- Sound cutting out while the picture breaks up
- Problems that come and go at similar times each day
The simple fix: a 4G/5G filter
We fit a small 4G/5G filter either at the aerial end of the system or behind your TV. This blocks out the mobile frequencies so only the TV signal passes through. For many homes, this provides an instant improvement.
6. Poor Quality or Degrading Coaxial Cable
Not all coaxial cable is created equal. Older “budget” coax, and the thin brown cable often used years ago, is far more prone to wear, interference and water ingress.
Signs that the coax itself is the culprit include:
- The outer sheath feels brittle or cracked
- Signal quality drops when the wind blows or the cable moves
- Pixelation has gradually become more common over several years
We recommend upgrading to modern, double-screened coax which protects far better against interference and keeps the signal clean. When we carry out
aerial repairs and TV system upgrades,
replacing poor cable is often one of the most effective improvements.
7. Obstructions: Trees, New Buildings and Scaffolding
TV signals travel in straight lines from the transmitter to your aerial. Anything large in the way can weaken or scatter the signal, especially if it’s close to your property or sits directly in the line of sight.
Common examples around Sussex include:
- Trees that have grown taller over the years
- New buildings or extensions put up nearby
- Scaffolding on your home or a neighbour’s
- Large metal structures or solar panel arrays
In these situations, the best solution is usually to reposition the aerial. We may raise it slightly, move it to a different part of the roof or change the mounting position to get a clearer path to the transmitter.
8. Transmitter Changes and Freeview Retunes
Every so often, Freeview makes changes to frequencies or power levels at transmitters. When this happens, some homes need to retune or, in certain cases, upgrade to an aerial that’s better suited to the new setup.
If you’ve suddenly lost a group of channels, or retuning only fixes things temporarily, transmitter or frequency changes may be playing a part.
On site, we check which transmitter you’re using, what frequencies you should be receiving and whether your current aerial is designed to handle them. If not, we may recommend a modern wideband aerial or a grouped aerial matched to your area.
9. Faulty TV Tuners or Loose Connections
Although it’s less common, pixelation can sometimes be caused by the TV or set-top box itself. Tuners do fail, and HDMI leads can work loose – especially if the TV has been moved recently.
Clues that the tuner might be at fault include:
- Other TVs in the house work perfectly on the same aerial feed
- Pixelation remains even after you try another aerial point or cable
- The problem persists after a full retune
As part of our diagnostic process, we’ll test the signal with a portable meter or a different TV. If everything checks out apart from one particular set, we’ll advise on repair or replacement options.
10. An Aerial That Has Reached the End of Its Life
Most TV aerials have a working life of around 10–15 years. In coastal areas, salt in the air can shorten that considerably. Over time, metal parts corrode, elements loosen and the aerial simply stops performing as it should.
Typical signs of an aerial past its best include:
- Visible rust and corrosion on the aerial or bracket
- Movement in the aerial when the wind picks up
- Worsening picture quality over the last year or two
In these cases, the most reliable fix is a
new aerial installation.
A properly installed modern aerial, correctly aligned and connected with good cable, should give you many years of trouble-free viewing.
Why Pixelation Is Worse in Some Sussex Areas
We’re often asked why one house has constant pixelation while the neighbour’s picture is perfect. The reality is that every property has its own combination of height, surrounding buildings, trees and line of sight to the transmitter.
Sussex adds extra complications: we have hills, valleys, coastal reflections and a mixture of transmitters covering different areas. All of this means two houses on the same street can have very different reception conditions.
That’s why it’s so important to treat each installation individually rather than relying on a “one size fits all” aerial. Our engineers regularly work in locations such as
Brighton & Hove,
Eastbourne
and
Worthing,
each of which has its own reception challenges.
Frequently Asked Questions
Why does my TV only pixelate in bad weather?
Bad weather can temporarily weaken the signal or move an already-loose aerial slightly out of position. It can also worsen problems caused by water in cables or poor connections. If pixelation appears mainly in rain or high winds, it’s a strong sign the system needs checking.
Can a booster fix pixelation?
Sometimes, but not always. A properly specified amplifier can help if the signal is weak but clean. However, if the signal is already noisy, a booster may just amplify the noise and make things worse. That’s why we always measure the signal before recommending amplification.
Should I retune my TV every time I get pixelation?
No. Retuning is only needed after transmitter changes or if your TV has lost channels completely. If you retune while the signal is poor, your TV may “forget” channels it can’t see properly. Frequent pixelation is usually a sign of an underlying signal or hardware issue, not a tuning problem.
When to Call a Professional
If you’ve checked the basics – retuned once, checked obvious loose connections, tried a different HDMI lead – and the problem keeps coming back, it’s usually time to get the system tested properly.
Pixelation that appears across multiple channels and at different times of day almost always points to:
- A weak or unstable aerial signal
- Water or damage in the cabling
- Interference from mobile masts or other sources
- A distribution or amplifier fault
- Or a combination of several smaller issues
Our engineers diagnose these issues using professional meters rather than guesswork. In most cases we can restore a clean, stable picture on the first visit.
Same-Day TV Aerial & Satellite Repairs in Sussex
If your TV picture is breaking up, freezing or pixelating, and you’re in East or West Sussex, we’re here to help. We deal with everything from simple loose connections right through to full
satellite and Freeview system upgrades
for homes, businesses and commercial properties.
Call our local team today on 0800 802 1791 to book a convenient, same-day appointment.
