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Combining two dissimilar antennas that share the same band(s) will almost always require a set of tuned filters. Channel Master used to offer such a product, the JoinTenna. At this point, the only source I know of offering a similar product is tinlee.com. I'd look at their AC-7 as well as their multichannel combiner assemblies.
Before spending any money on accessories, I'd turn the HD1850 in the direction of the stations you're looking for. If a deep-fringe, all-channel, roof mounted antenna is not seeing the desired signals, how on earth would any attic mounted antenna have hope of acceptable results?
FWIW, the differences in performance between the HD8200U and HD1850 are quite small, certainly not enough to expect one to overcome the added penetration loss of an attic/roof structure as compared to the other.
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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Last edited by GroundUrMast; 25-Feb-2014 at 4:08 AM.
Reason: grammar
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