Why is my TV reception bad? A Brisbane fault-by-fault diagnosis
National help articles cannot tell you which transmitter serves your street or that your south-east neighbour needs a vertical antenna. This guide can. Find your symptom, follow the branch.
By the Topline Antennas crew · Published 24 August 2026 · Brisbane, QLD
Start here
Match the symptom, not the guess
| What you see | Most likely cause | Your next step |
|---|---|---|
| Fine in fair weather, pixelates in wind or rain | Marginal signal: tired antenna, corroded connections, or the wrong antenna plane for your site | The south-east polarisation check below, then a meter reading |
| One whole group of channels missing (all of Seven's, all of the ABC's) | Each network's channels share one frequency - a group dropping means that frequency is not arriving. Aim, antenna band, or a retune | Manual retune first (free); if the group will not return, it is an aim/band problem |
| Everything gone, "no signal" on every channel | Hard failure: cable, connection, masthead amplifier power, or the antenna itself - storms and cockatoos are Brisbane's usual suspects | Check the amplifier's power supply at the TV end first, then book the roof check |
| Worse in the evening, or since a hot spell | Heat-stressed amplifier or corroded joint moving with temperature; occasionally atmospheric ducting bringing interference | A meter reading at the outlet and at the antenna isolates which side of the roof it is |
| One TV bad, the others fine | Not the antenna: that outlet's cable, wall plate or splitter leg | Swap the TV to a known-good outlet to confirm, then fix the point - see TV points |
| Every TV a bit bad, worse after adding outlets | Splitter loss - every split halves the signal - or an amplifier now working past its limits | Distribution needs re-planning, not a bigger booster |
The local layer
The Brisbane-specific causes national guides miss
The south-east polarisation trap. If you are in Springwood, Daisy Hill, Beenleigh, Logan or the Redlands and reception has "always been average", check which way your antenna's elements run. This region is served by Darlington Range - UHF, vertically polarised, 1.8 kW - while most antennas ever fitted point horizontally at Mount Coot-tha, which the terrain here shadows. Wrong plane costs more signal than any booster can give back. The full data is in our Brisbane transmitter map, and the finder gives your suburb's answer in one click.
Over-amplification in the inner city. Mount Coot-tha transmits at 50 kW. Close to it, an amplifier on an already-strong signal overloads the tuner - the picture breaks up in a way that looks exactly like weak signal, and a second booster makes it worse again. If your reception got worse after "boosting", this is why.
4G/5G in the 700 MHz band. The frequencies directly above TV now carry mobile signal. Older wideband antennas and amplifiers swallow it whole and overload. The fix is a 4G filter or a current antenna - more gain makes this one worse too.
The wrong-market auto-tune. Brisbane fringe TVs happily lock onto Gold Coast or Sunshine Coast transmitters and store the wrong region's channels. Right networks, wrong news, mediocre signal. A manual retune against the correct RF channels fixes it - walk-through in this guide.
Storms and wildlife. Brisbane's storm season moves antennas and cockatoos strip cable insulation - both cause the fair-weather-only pattern. If reception changed after a specific storm, photograph the roof before anything is touched: it matters for insurance.
Stop guessing - get the reading A meter reading at the antenna and the outlet finds the fault in one visit → or call 0467 098 943.
Questions
Reception FAQs
Why does my TV pixelate only when it rains or blows?
Because your signal is marginal: strong enough in still, dry air, not strong enough once rain attenuates it or wind moves a tired antenna. The cause is usually a worn antenna, corroded connections, or - in Brisbane's south-east - an antenna in the wrong polarisation plane for the Darlington Range transmitter.
Will a signal booster fix my bad reception?
Only if the problem is genuinely weak signal on long cable runs or many outlets. A booster cannot fix a polarisation mismatch, a broken cable or interference - and in inner Brisbane it routinely makes reception worse by overloading the tuner on an already-strong Mount Coot-tha signal.
Why are some channels missing but not others?
Free-to-air channels travel in network groups, one frequency per network. A whole group missing means that one frequency is not arriving - an aim, band or retune problem - while a random scatter of missing channels usually points at signal quality.