Dear Andy, Roelof, LF Group,

PA0RDT wrote:

Have you tried to mount it on a four metre high non metallic pole?
It probably is still inside the noise field of the building, which drops
off within a few metres.

G4JNT wrote:

That wouldn't make any difference.  The mount to the metal frame was
non contact, and the outer of the coax forming the counterpoise will
always be the interference injection point as teh rubbish is being
picke dup on th ecoax outer as it feeds its way thuorgh the ducting to
the outside world.

Cheers, Jim Moritz