Wall caution

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Wall caution

Ken Kopp-2
Don't forget that many homes today use foil-backed insulation.  
The foil is ... obviously ... conductive.  I use two 1/4 x 20 threaded
brass rods with cone insulators on both the inside and outside of
the wall.  I made larger holes and removed the foil around both
holes before installing the feed-throughs.

73!  Ken Kopp - K0PP
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