Whirlybird I can't get Channel 5, via the terrestrial aeriel either.
But the Sky mini-dish & digibox, not only gives perfect Channel 5, but other total time-wasters (oops sorry - educational channels
) such as Discovery Wings. With a bit of planning & searching through the programme guide, you can watch almost non stop aviation related programmes.
And
BRL this is not an advert, as I have no connection with SKY! (I am just a sad telly addict)