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Yes, filters with very sharp cutoff frequencies are doable. Tinlee.com is a source that comes to mind. Tuned cavity filters are a likely design.
However, the problem with adjacent channel interference is that the FCC does not require any transmitter to be 'perfect'. In reality, a transmitter will produce a very small amount of signal outside it's intended frequency range. The FCC has technical standards that limit this 'spurious emission' but when there is a great difference in the strength of a local signal source and a weaker or more distant source, the tiny amount of 'off channel' signal from the more powerful station will be strong enough and in the frequency range of the weak signal... making reliable reception difficult or impossible.
The only way to cure this is to place more filtering on the 'offending' TV transmitter output. (You & I don't have a key to their transmitter building so that isn't a good option) Or, find or build an antenna that is so directional that it receives dramatically more of the desired station's signal while receiving much less from the 'offending' source(s).
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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; 16-Jul-2012 at 7:18 PM.
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