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S Band Helix

I'm doing some "stuff" with 2.4 ghz helix'.  I have seen some designs
that use a plastic type pipe  (pvc) for a form.  I bought a 1.2 ghz 
helix on ebay that is a commercial unit and is enclosed in a large pvc
type pipe.  Do these forms have a significant impact on the performance
of these antennas?  I have read conflicting information about this.  I
want to establish a general consensus of what is "right".

73 Bob W7LRD
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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