Sounds like a Cushcraft ATB-34. They were just discussed at length here on
the reflector. Including a link for the manual.
Do a search at the tower talk archives and the manual link should pop up. Or
Google ATB-34 and you'll probably find it.
From: "N6FD" <firstname.lastname@example.org>
Sent: Sunday, January 16, 2011 8:05 PM
To: "Tower Talk" <email@example.com>
Subject: [TowerTalk] Need help identifying an old tri-bander
> I bought a tri-bander used from a silent key's estate. His wife did not
> have any documentation for the antenna. Given the state of the antenna
> and the tower that I got with it, it was probably put up some time in
> the 70's or 80's. No markings have survived on the antenna. The
> following are the details of the antenna. I don't have the original
> spacing between the elements.
> Boom length: 278 inches, in three sections
> Reflector: 382 inches with one set of traps
> Driven element: 317 inches with two sets of traps, center insulated,
> fed with balun
> Director 1: 209 inches, no traps
> Director 2: 293 inches with two sets of traps
> Elements are mounted on rectangular aluminum plates, these are attached
> to the boom with U-bolts. Element sections taper out from the boom.
> Each section is attached by slit tubing and a clamp. The clamps are
> galvanized steel sheet metal with the clamp nut secured by a small tab
> of the clamp. The clamp screws are perpendicular to the element.
> The traps have covers that appear to be fiberglass with plastic end caps
> (disintegrating in the environment). The trap cover has a small weep
> hole in it. The trap coil is bare aluminum wire secured to the
> fiberglass insulator at each end with a screw. The wire is covered and
> held in place with a thick black paint. The 10M trap is 10 turns space
> wound 1 wire diameter apart. The 15M trap is 16 turns. The reflector
> has only the 15M trap.
> The driven element is a dipole with a phenolic center insulator. This
> is clamped to the boom adaptor plate with a couple of U-bolts. I have
> not had a chance to check the performance of the balun yet.
> If anybody knows what this antenna might be, and where to get a manual,
> please let me know. I will try to get some pictures up tomorrow to help
> 73, Erich
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