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Just to close this out In case someone else runs into a "commercial" installation like this. I found the ONLY way to get reception was to go above the roof line. Even with a new balun and good tight connections the reception was very low anywhere up on the roof. I ended up about 7' above the roof line with a ChannelMaster 7777 and we were able to pull in I believe 44 "channels". Good enough for me to have a beer and consider it job done.
Moral of the story, metal flashing is not your friend if you are an antenna (or rain for that matter too).
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