Here is a starting point: http://en.wikipedia.org/wiki/ATSC_standards
Virtual channel numbers are like the address label on an individual envelope inside a bag of mail. The VC helps the receiving set identify the data associated with an individual program when there could be several other streams of data interwoven in the information transmitted by the station. Virtual channel numbers are added at the station during the MPEG-2 multiplexing process. Multiplexing is a method of combining unrelated data streams for transport or storage, in a way that each data stream can be later separated from the other data.
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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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