8th May, 2026
Why Is My TV Losing Channels? (The Real Reasons and How to Fix It)
You sit down to watch the news, and Channel 9 is gone. Or you go to put on the cricket, and ABC is suddenly missing. Or you retune your television and find three fewer channels than you had last week.
Missing or lost TV channels are one of the most common and frustrating reception problems Australian homeowners experience. The cause is almost always one of a small number of identifiable, fixable issues. Here’s exactly what they are and what to do about each one.
The Most Common Reason: Frequencies Have Changed, and Your TV Needs a Retune
Australian free-to-air channels are broadcast on specific frequencies that are periodically reassigned and updated by the Australian Communications and Media Authority (ACMA). When a frequency changes and your TV hasn’t been retuned, it’s still looking for the channel on the old frequency – which is now empty. The channel appears to have disappeared, but it’s actually just moved.
This is the simplest fix of all. Go into your television’s settings menu and run a full auto-scan (also called a channel search or auto-tune, depending on your TV brand). This takes between 3 and 10 minutes and updates all channel frequencies to their current assignments. In most cases where channels have simply vanished, this resolves the problem immediately.
The ACMA publishes a frequency change schedule on its website so you can check whether a change has recently occurred in your area.
Your Antenna Has Physically Moved or Been Damaged
Antennas are mounted on rooftops and masts and are exposed to everything the Australian weather throws at them – storms, high winds, UV degradation, and in coastal areas, salt corrosion. Over time, even a securely mounted antenna can shift position slightly due to wind movement, or can suffer physical damage that affects its ability to point accurately toward the broadcast tower.
Even a few degrees of misalignment from the correct bearing can reduce signal strength enough to cause channels with marginally weaker broadcast signals to disappear entirely, while stronger channels remain. You might lose ABC or SBS (which sometimes broadcast at lower power than the commercial networks in certain areas) while channels 7, 9, and 10 remain intact – or vice versa, depending on your location.
This is not a fix you can complete yourself. Correct antenna alignment requires a calibrated signal meter to measure the actual signal strength at each point of adjustment. Without one, repositioning an antenna by eye is guesswork.
Your Antenna System Is Aging
Australia’s digital television system operates on specific frequency bands that differ from the old analogue system that was switched off nationally by 2013. Antennas installed before the digital switchover – or even shortly after – may now be more than a decade old.
Older antennas degrade over time through:
- Corrosion of the metal elements that receive the broadcast signal
- Deterioration of the junction between the antenna and its cable
- UV damage to plastic components and housing
As these components degrade, the antenna becomes progressively less capable of capturing a reliable signal across all channels. You may find that channels drop in and out, that reception is reliable on some days and poor on others, or that certain channels disappear entirely while others remain clear.
Damaged or Aged Coaxial Cable
The cable running from your antenna to your TV plays an equal role in your reception quality as the antenna itself. Old coaxial cable – particularly the type installed during the analogue era in the 1980s and 1990s – was often not rated for the digital frequency bands in use today. Even if it was correctly specified at installation, aged cable develops cracks in the sheathing, moisture ingress at joins, and corrosion at connectors over time.
A cable that is losing signal to moisture or corrosion will cause channels to drop selectively – typically the ones that require the most signal to decode reliably. You won’t lose all channels at once; they’ll disappear one or two at a time as the signal degrades below the minimum threshold each channel requires.
Nearby Construction or Tree Growth
Two environmental changes that happen gradually but have significant impacts on TV reception:
Trees. A tree that has grown significantly since your antenna was installed can now be directly in the signal path between your antenna and the broadcast tower. Eucalypts and other Australian native species are particularly effective signal absorbers when they’ve grown to full height. If you’ve lost channels gradually over several years without any obvious event, tree growth is a prime suspect.
New buildings. A new multi-storey building or large structure constructed between your property and the broadcast tower can block or reflect signals in ways that reduce specific channel availability. This is most common in areas experiencing significant residential or commercial development.
5G Network Interference
The ongoing rollout of 5G mobile infrastructure across Australian metropolitan areas – particularly in inner Melbourne, Sydney, and Brisbane – is creating a new source of signal interference for some homes. 5G frequencies can interfere with specific digital TV channels in areas close to 5G towers, particularly if your antenna system doesn’t include an LTE filter.
The ACMA has published specific guidance on 5G interference and TV reception, including which areas are most affected and what solutions are available.
What to Do Right Now: A Step-by-Step Approach
Step 1 – Retune your TV. This takes five minutes and resolves the problem if frequencies have changed. Do this first before anything else.
Step 2 – Check your connections. Ensure the coaxial cable is firmly seated at the back of your TV and at the wall plate. A loose connection is a surprisingly common cause of sudden channel loss.
Step 3 – Look at your antenna from the ground. Check for obvious physical damage, obvious misalignment, or if a tree has grown significantly in the signal path.
Step 4 – If channels are still missing after Steps 1-3, book a professional signal assessment. A licensed technician carries a calibrated signal meter that can measure signal strength across all channels at your specific property, identify exactly where the loss is occurring, and diagnose the fix required.
Mr Antenna provides signal assessments and repairs across Australia. In most cases, the diagnosis and repair are completed in a single visit.
Will the Fix Last?
Yes – when the root cause is correctly identified and properly addressed. A properly installed, correctly aligned antenna with quality cabling should deliver consistent, full-channel reception for years without requiring attention.
The key is treating the actual cause rather than applying a workaround. A retune resolves a frequency change but does nothing for an aging antenna. A new antenna does nothing if the cabling is the actual problem. Professional diagnosis ensures you’re fixing the right thing.
