One problem - it sounds as if the coax is going to have to be long
enough that, even with LMR600, it might not be better than an antenna
mounted lower but much closer.

I am going to go and measure again, but assuming I measured wrong
before, Is a 100 foot run too long for the antenna to work properly? I
am probabaly going to use 300 ohm twin lead for the lead in, unless
people think it should really be coax. See a picture of the proposed
set up at http://community.webshots.com/photo/...24626583NExHgY