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rabbit73 has given you a great place to start... the symptoms you've described clearly call into question the assembly of the antenna. If there's a loose or open connection, or a short between the phasing lines and the boom you can expect erratic performance that kills some channels while still offering some reception on others. If not assembled correctly, the High-VHF section of the antenna may be partially of fully disconnected... That coincides with the majority of the real channels you've listed. (Virtual channels tend to confuse the conversation here... The antenna has no awareness of virtual channels, just the real channel numbers count when discussing the antenna system.)
To simplify even further, I would eliminate the preamp from the system during the initial trouble shooting of the antenna. I would simply use a single piece of coax from the antenna to a single TV that's known to have a good tuner set up for OTA signals (not cable). I would use the shortest length of coax that allows for safe and practical connection of the test TV. If you have 50' or less coax, the antenna should be able to drive it without a preamp being needed.
Only after you have established that the antenna is assembled and aimed correctly should you be concerned about the preamp... It's job is to overcome the losses caused by the coax and splitter.
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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; 15-Apr-2013 at 10:18 PM.
Reason: VC's vs. real channels
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