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All posts by Chris.SE

Below are all of Chris.SE's postings, with the most recent are at the bottom of the page.

@Tom Meek
Yate should be easily served by the Mendip Transmitter (though some locations near Westerleigh could be slightly tricky). Unless you are in some sort of dip or have a lot of trees near you on the line of sight between you and the transmitter, then you should have no trouble if your installation is not faulty.
The HD channels for BBC1,2,3, ITV & Ch.4 are carried on the BBC B (PSB3) multiplex which on Mendip broadcasts on UHF Ch.58 near the top end of the C/D aerial band.
HD channels for BBC4, BBC News, Ch.4+1, 4seven & etc are carried on the COM7 multiplex broadcast on UHF Ch.33 which is in the A aerial band. (see near the top of this page for a full listing of channels).

Ch.58 is the highest frequency from Mendip, and if you have any occasional intermittent problems with any of the regular ITV & Ch.4 channels carried on the D3&4 (PSB2) multiplex broadcast on UHF Ch.54 then there is a good possibility that your installation has deteriorated. Higher frequencies will usually suffer significant degradation with a failing installation, whether it be corroded connections especially at the aerial, elements missing from the aerial, or coax deteriorated from water ingress.
So if your installation is a number of years old, it could well be time to have it replaced, certainly checked by a competent person. If you are having it replaced then you should use a Group W or Log Periodic aerial, although the old group C/D aerials made in the latter days of analogue transmissions will just about give a reasonable signal on Ch.33. the current channels in the C/D band will be moved in future years down to Band A, so a wideband aerial is the correct one for a replacement.

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