However you should be aware that with Digital Switchover on its way soon, a loft aerial is usually not much use for Freeview.
Unless you are VERY close to the transmitter, Freeview needs a good, correctly aligned outdoor aerial.
T
April 2009
Relatively easy.
Much will depend on ability to get up there - familiarity with and access to hand tools - attitude to dust and spiders (there won't be many) and lighting. You should obviously take care to stand on the wooden rafters rather than between them.
Peccavi
April 2009
I can answer this question...
How easy is it to replace a TV aerial in the loft?