Would you gain any increased reception by connecting a CM4221 through the cable-in connection, and then using a diplexer to run a CM4228 antenna through the satellite-in connection? The antennas would be pointed in different directions.
In theory - the E86 will take one local channels input on the Satellite in, from a diplexer, and one local channels input from either an OTA or cable. I've not seen it work, but I may try to do the same thing - with two OTA antennas (one for Kansas City and one for Topeka - if I can get WIBW-CBS to pull in).
You absolutely can input two local zip codes in the Setup/Installation menu, but I've not seen/heard this same setup work in reality...
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