Why Does My TV Keep Pixelating? (And How to Fix It for Good)

There’s a particular kind of frustration that comes with watching your TV dissolve into coloured blocks at exactly the wrong moment. A goal. A match-deciding serve. The final reveal of a season finale.

Digital TV pixelation is one of the most common complaints from Australian homeowners – and in the vast majority of cases, it is entirely fixable. The question is understanding what’s actually causing it.

What is TV Pixelation, Exactly?

Pixelation happens when your TV’s digital decoder doesn’t receive enough signal data to construct a complete picture. Instead of a clear image, it displays the last usable frame, breaks into blocks, freezes, or drops the picture entirely.

Unlike old analogue television – which would gradually fade to static snow as the signal weakened – digital TV operates on a cliff-edge principle. You either have sufficient signal to produce a perfect picture, or you don’t. There is very little in between.

This is why pixelation can feel random or unpredictable. Your signal may be hovering just below the threshold your TV requires, and any additional interference or degradation tips it over the edge.

According to the Australian Communications and Media Authority (ACMA), signal quality issues related to antenna installation and cabling are among the most common causes of free-to-air reception complaints across Australia.

The Most Common Causes of TV Pixelation in Australian Homes

1. An Old or Degraded Antenna

Most antennas have a practical lifespan of 8 to 15 years, depending on quality and local conditions. As they age, metal elements corrode, connections loosen, and the antenna becomes progressively less efficient at capturing broadcast signals.

If your antenna was installed more than 10 years ago, it may be past its useful life even if it looks physically intact from the ground. Corroded connection points, bent or missing elements, or a unit that was never rated for HD digital broadcasting are all common culprits.

The older antenna types may not be optimised for current digital broadcast frequencies particularly in areas where transmission towers have been updated in recent years.

2. Damaged or Aged Coaxial Cable

The cable running from your antenna to your TV is just as critical as the antenna itself. Old coaxial cable, damaged sheathing, moisture ingress at connectors, or corroded joins all cause signal loss that is significant enough to cause pixelation.

This is particularly common in Australian homes built before the digital switchover, where original antenna cabling was never updated.

3. Trees and Physical Obstructions

Trees that have grown since your antenna was installed are one of the most overlooked causes of signal degradation in suburban Australia. Eucalypts and liquidambars in particular are known to grow quickly and can create obstruction problems within just a few years of an installation.

New buildings constructed nearby, large sheds or pergolas, and even atmospheric conditions such as temperature inversions which can temporarily reflect signals in unusual ways  are all known contributors to signal problems.

4. Antenna Misalignment

Antennas must be precisely aimed at the nearest broadcast tower to receive the strongest possible signal. They can be shifted over time by strong winds, storm events, rust at the mounting point, or incidental contact during roofing work.

Even a small deviation from the correct alignment can reduce signal strength enough to cause intermittent pixelation, particularly in fringe reception areas or during weather events.

5. Signal Amplifier Failure

Many antenna systems include a signal booster or distribution amplifier to deliver signals across multiple TVs. These components can fail gradually, introduce interference, or –  if misconfigured – actually worsen signal quality by overdriving a weak signal with added noise.

6. Multiple Splitters Reducing Signal

Every time a coaxial cable is split to serve an additional television, the available signal is divided. A system feeding four or five TVs through a series of old passive splitters may not have sufficient signal strength remaining at each point to maintain a stable picture.

7. 5G Network Interference

The ongoing rollout of 5G mobile networks across Australia has introduced a new source of potential interference for some households – particularly in inner-city suburbs near mobile tower infrastructure. Older antennas that lack integrated LTE/4G filters can be susceptible.

What You Can Try Yourself First

Before calling a technician, these steps are worth checking:

Inspect connections. Ensure the coaxial cable is firmly seated at the back of your TV and at the wall outlet. A loose connection is sometimes the entire problem.

Retune your TV. Go into your TV settings and run a full auto scan. Broadcast frequencies do shift periodically, and returning can pick up a better signal path. The ACMA’s broadcast schedule lists recent and upcoming frequency changes by region.

Look at your antenna from the ground. Check for obvious physical damage, bending, or misalignment. Also inspect the cable where it enters the roof or passes through the wall – cracked sheathing allows moisture in.

Test one TV directly. If your home has multiple TVs, disconnect the splitter and run a single cable directly from the antenna to one television. If the pixelation disappears, the distribution system is the problem.

When You Need a Professional

If you’ve worked through the basics and pixelation continues, the fault almost certainly lies with the antenna, cabling, or mounting system – and these require a licensed technician to diagnose and fix safely.

Working on a roof without the correct equipment and training is a genuine safety risk, and attempting to adjust an antenna by eye is rarely effective without a calibrated signal meter.

A professional technician from Mr Antenna carries a signal meter to measure actual signal strength at your property and identify precisely where the problem is occurring. In most cases, we diagnose and resolve the issue in a single visit.

Book a free antenna inspection and signal test

How Long Should a Proper Fix Last?

When the root cause of pixelation is correctly identified and properly repaired – whether that’s a new antenna, full cable replacement, or precise realignment – you should expect years of trouble-free reception. Quality antenna installations, backed by proper workmanship, routinely last a decade or more without needing attention.

The key is treating the real cause rather than applying a temporary fix. If your antenna is genuinely at the end of its life, repointing it won’t serve you as well as a proper replacement with a modern, correctly rated antenna.