+=>
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And to answer your next question.
Yes you can install the antenna down lower and Test reception.
Use a 5 foot tripod antenna mount such as the ,
http://www.ronard.com/909911.html.
Just set it on the roof , not bolted to the roof.
Or you can as an example you can , tape , the DB8e antenna to a chimney to Test reception.
Or some other creative way to get the DB8e up in the air to Test reception.