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I am sorry about the previous posting.   When I was talking about
grounding the foil to the side of the antenna I left a very important
word out.   The sentence should  have read:

For vertical 1/4 wave antennas such as the transponder and DME
antennas, which mount onto the fuselage, you need a ground plane anyway,
so the foil actually helps, as long as it is grounded to the  SHIELD
side of the antenna, i.e., grounded to the antenna mounting hardware

Ken.

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.