Has anyone ever bought a external digital atsc tuner, how many hd channel could you recieve?

Answer 1

The number of channels you can receive depends on many factors, including

a) The strengh of your antenna
b) The number of stations close by
c) how clear is the path between you and the transmitter (hills, trees, etc.)

Go to http://www.antennaweb.org/aw/welcome.aspx , type your address and you can find how many stations you can get for a particular antenna