[BC] Ground system

[Craig Healy]

How about this?

A tall tower, maybe 500' commonly used by 50kw FM stations.  To add an AM to 
it, use a skirt feed.  Rather than at ground level, put the feed up at the 
lowest guy wire point.  Bond those guy wires to the tower and put a long 
fiberglass insulator a quarter wave or slightly more out from the tower. 
Those become the radials.  Insulate all the above guy wires just as at any 
AM station.

Yes, the ATU would be up on the tower, but it's no real issue.  If there has 
to be a base current reading, do it with a video camera remotely.

No copper to be stolen, tower itself grounded and no need for an isolator 
for the FM or STL cables.

The skirt feed length would depend on frequency.  If the AM was at the upper 
part of the band, the feed could be up another guy wire level or so.

Craig Healy
Providence, RI