I've tried several loops that really helped drop the noise floor but varied widely in sensitivity.? My favorite is the W6LVP active loop.? It has a low noise preamplifier on the loop powered by an included bias-T power source between the loop and the receiver.? Not cheap but an excellent performer that should fit in your attic easily, and it'll far outperform the long wire you're using now.
More information here:??
Passive loops like the "youloop" work but are far less seensitive.? You can get one from Amazon here:?
Russ
