[Antennas] Identify this antenna ? "DECIBEL"

[Demetre Koumanakos]

Happy New Year to all group members...

While visiting a relative "down south" for Christmas I found a
used VHF ground plane.
The vertical radiator is a closed monopole 41 cm from the base to
the highest position where it begins to bend down to the base again.
There are 4 horizontal radials 73 cm each from the tip to the center of 
the base. The radiator is marked "decibel".
I hooked it up to my antenna analizer and got 171 Mc as the best match, 
if my analizer tuned higher I assume the antenna would match at 200 Mc 
or so...

I want to tune this antenna for 2m, in theory I know what to do, but a 
ceramic dome installed between the base and where the upward section of 
the radiator troubles me, is this a casing of a coil or something 
similar ??? Before I start dimentioning the new aluminum tubing, I 
would like to know all I can find out about this antenna.

Can anyone help ??

73
Demetre - SV1ENS


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