Ubbe
Member
Ubbe - If you have an antenna 1000 feet away from your room, but has poor common-mode properties from the coax, noise from your house / shack can travel right down the outside of the braid to the feedpoint of the antenna, and then right back into your receiver on the inside just like any radiated signal - so be careful. It's why ferrite chokes are popular in many installations.
That's why I have a transformer balun and a magnetic balun for random wires and one balun for dipole work. I had tremendous amount of interferences when I tried a wire going directly to my HF receivers. I need a long coax to seperate me from my house but the neighbours house are just as bad and too close to my fence. I have a ALA loop antenna that works pretty good and a vertical from RF systems that I haven't tried yet. I'm about to set up two 10 fot aluminum poles on the chimney to add to the one I already have and see what I can install to them.
/Ubbe