I was just looking at
http://www.digitaluk.co.uk postcode checker for the aerial trade.
In 2012, switchover for me at Crystal Palace, all is green "good reception". And only 4 retunes too.
But then in 2013 we drop to orange "variable reception" on Mux C.
It is not obvious what services are on Mux C - probably BBC1 and ITV1
Looks like I'll be on the roof turning the aerial 180 degrees to get Sandy Heath.
Or have two aerials. Wonder how to join their signals together?
(Lord help the Sandy Heath users, they get 6 retunes in 2011 and another 6 in 2012).
It all makes tweaking ADSL seem easy.
Cheers,
Peter
Post-post edit: this link is interesting
http://www.megalithia.com/elect/terrain.htmlplus his other pages about setting up aerials, and thanks Tony for the
helpscheme link below.