With due respect, you will need to get outside and take a look at the aerial connections.
Go and see if they need any attention. Check the aerial is still mounted correctly and that the coax is terminated nicely. This may require cutting 4cm off the coax and reterminating the end etc. Also check inside at the other end of the coax.
It sounds like you're getting a weak signal which is therefore able to be interfered with easily. Get a rock solid signal in the first place and it should be strong enough to overcome these minor local disruptions.
Time to get your hands dirty. Older styled saddle and clamp connections at the aerial can all be tidied up fairly easily without the need for specialised crimping tools etc.
Nerdherder: Also, I seem to remember there being a broken line on the balun for the aerial when I got it.
Maybe I should replace it. Can get cheap enough from Jaycar. Would part LT3026 be right?
No. That's designed for VHF antennas and won't fit a 43 el UHF. The UHF antennas usually have a circuit board balun inside the connector box. You need to inspect the antenna and co-ax. I presume you do have a UHF only antenna and no thers connected via a diplexer or anything? For Freeview you should have a single UHF only antenna and high quality rg6 cable direct to the TV and other Tuners.
Nerdherder: Yep, just UHF 43 element, no other diplexers, antennae or anything attached...
OK, that's a good start. Just as a matter of interest, my 43 el has been up about 3 yrs now and the reflector is all rusty, the elements are corroding and the plastic box looks like its suffering from ultraviolet degradation. Still works OK though. There's a lot of salt spray in the air in Auckland and they don't make the antennae to last now like they did back in the 60s when TV started in NZ. I reckon 5 yrs is about the limit between renewals. They used to last 30+ yrs easily.
Yeah I hear ya there. We used to have a smaller element aerial (21 elements is it?) that we first had, when I pulled it down a few years ago the mesh was all rusty, as was the hardware and each juncture was corroded...
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Got the new RG6 cables and F plugs on there. Now is solid if wriggle everything around, and the quality level went up comparing before installation, so I'm happy with the minor investment.
TV tuner says TV1 62 Signal TV3 38 signal Kordia 27 signal
All channels quite watchable, although a bit grainy on HD (TV2). Leads me to believe quality more important than strength to get apicture. But should be able to increase from here!
FYI just to see the effect I added a splitter (this is how I will want to run setup in future) didn't affect quality, but reduced strength by 10%.
Will get on the roof when the rain stops, aerial and coax check next..
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