[Antennas] Expanding foam and antenna tunning

[Demetre Koumanakos]

Hi All,

I constructed and installed a 50 Mc vertical coaxial center fed
antenna this past weekend, the antenna itself is housed inside
a fiberglass fishing rod in order to keep the coaxial vertical.
the antenna tunned nicelly throughout the band with less than 1.7
SWR.
The fishing rod itself seems to handle the wind nicely but the base 
of it where it is secured on two wooden planks with U bolts may need 
some reenforcing so it doesn't crush from the wind pressure at the U 
bolt contact points.

I thought of the Expanding Foam (Poly something....) used for 
insolation, but I was thinking, would this effect tunning ? has 
anyone had any experience with expaning foam on antenna applications ?

73
Demetre - SV1ENS

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