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I checked out the Antennacraft, is there that much difference between my CM and that one? If I stay with my CM will it work well with the RCA amp? Thanks.
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The CM-3671 has elements for the L-VHF band (real channels 2 through 6 and the FM radio band). The HBU series antennas omit the L-VHF capability. When there is no L-VHF signal to receive, it seems more reasonable to use antenna that has the capability you actually need. However, you own the CM-3671, so use it.
Another thought, you reduce the chance of interference a small amount when you use an antenna that is sensitive only in the frequency range(s) you are trying to receive.
If you already own the RCA preamp, there's no point in spending more money on a CM-7778 or other preamp. The RCA will do quite well and matches up to any non amplified consumer grade TV antenna.