Originally Posted by
frostbite
Keef, if the roofing felt under your tiles has a layer of foil, you're not going very far and certainly not going to achieve 1:1.
I did wonder that, but the others all get close to 1:1, and the little 50MHz one goes like the clappers (working VKs when the band was open).
Maybe there's a load of resonant stuff in the roof insulation ... hadn't thought of that.