I can pick up 10 local stations with my mini-10 while hooked up to my rooftop antenna.
Some of these are "subs". I actually get 5 networks.
Since I do not have cable or satellite, I've rewired my antenna system to optimize it for the current digital system we have in the US.
I followed guides over at avsforum.com.
There's a lot of good info there on terrestrial broadcast TV and reception.
After using my rooftop antenna to scan in the channels, I can use the "portable" antenna to pick up "most" of these channels at my location.