Richard gave you an honest answer, but didn't elaborate. If you try to push RF back up the center conductor of the
coax, it will fry the first device it gets to, and not do much else. If you try to feed the shield against some other
"ground", then most of the "antenna" thus formed will be inside the building, and therefore not much of an antenna, and
will be horrible on receive as it will be close coupled to every noise source imaginable (can you say switching power
supplies in every electronics box known to man plus motor controls etc., etc.). So, try it, but be sure you have good
legal representation lined up first.

--
Crazy George
Remove N O and S P A M imbedded in return address
"ml" wrote in message ...
hi

Realize this is perhaps a long shot but cavities and filters arent my
bag...

I live in a 12 story apt building that has a master tv antenna

the standard tv type but rather a bit larger than usual

it's fed via coax and not sure whats on the roof but asume some sorta
dist amp

on each floor is a bunch of spliters to break the coax into 'ports' for
each apt bout 6 per floor


just wondering a really crazy wackey thought

would their be anyway i could use this as a hf antenna while somehow
isolating it from doing damage to the tv's , amps ???


it would be basically to be a low impact stealth install obv if i
install anything the buidlng mgt would be involved but people passing on
the street wouldn't know