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1. [TowerTalk] Fwd: Rooftop tower as Vertical Antenna (score: 1): Author: Hans Hammarquist via TowerTalk <towertalk@contesting.com>; Date: Wed, 19 Dec 2018 04:59:27 +0000 (UTC); I don't think those concrete blocks have any good insulating value but other than that, go for it. You have to figure out some type of common mode choke for the feeders to the existing antennas, thou; /archives//html/Towertalk/2018-12/msg00215.html (8,971 bytes)
2. Re: [TowerTalk] Fwd: Rooftop tower as Vertical Antenna (score: 1): Author: Kelly Taylor <ve4xt@mymts.net>; Date: Wed, 19 Dec 2018 07:39:09 -0600; It seems to me the trick will be electrically isolating that which you want as an antenna from any conductors (ground wire, rotator cable, coax shield, etc.) leading down from the system. Tuned radia; /archives//html/Towertalk/2018-12/msg00216.html (11,128 bytes)
3. Re: [TowerTalk] Fwd: Rooftop tower as Vertical Antenna (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 19 Dec 2018 11:53:22 -0800; It's a mistake to think of the rooftop tower as the antenna -- the grounding wire is also part of the antenna, and it can be a useful part if the base is the feedpoint and some sort of counterpoise i; /archives//html/Towertalk/2018-12/msg00220.html (10,465 bytes)

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