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See Post #7.
A ,
http://www.antennacraft.net.
10G201 preamplifier can be added to the HD850 antenna of antenna system #2.
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And in place of the A/B switch used to change the Separate antenna systems at each Tv location.
A Separate , Tuner/Tuner Recorder , can be used to change antenna systems.
http://www.epvision.com.
The ePvision is connected to 1 antenna system and the Tv is connected to the other antenna system.