The antenna is a single external unit mouned to point towards Brokers Nose.
I have today noticed other nearby houses have slightly different aerials. Mine consists of wht is probably a combination VHF / UHF whilst many other newer housese have only the UHF type (long narrow with angle wings on the tail - best way to describe) and some even have what appears to be a square mesh style.
I'm wondering if it is worth getting the local installer who installed the original antenna back out and check the setup.
If all signals are coming from Brokers Nose to you, they are all UHF (on high frequencies). You wouldn't need the VHF part of a combination antenna. This is designed for the VHF channels, typically in a metro area (like Sydney). Channels like 6, 8, 11, 12 (dig 7, 9, 10, ABC).
The small wing tailed antennas are UHF only, directional Yagi style. The mesh ones are what's called Phased Array UHF ones. They pick up a more diffuse signal (less direct line-of-sight).
You may have faulty cabling or a splitter port. Short of moving TVs around onto different outlets to see if the problem moves with that, maybe getting an installer out is your best option.
One other thing you could try if you don't want to move the TVs is to get a long length of good quality RG-6 coax cable and take the TV signal from different outputs and try it on the different TVs, until you see what consitently gives problems.EDIT:
Some receivers will scan and take channel info, but not actually display the program. That is why some receivers will scan and pick up say 26 programs, while others may only get say 15.
What is better? To get more programs, or only the ones that will really work?
And what if you are scanning on a poor reception evening? Maybe on other nights the results would give OK reception. So the results vary, and you do get 'phantom' channels appearing that aren't really there.
Edited by charlesc, 02 August 2009 - 09:00 PM.