Using an outdoor antenna indoors is far more affective than those set-top /rabbit ear antennas. In fact most people that install antennas in their attic use the outdoor type. The big metal antennas have always worked best.
I have heard that the CBS is a real pain to get in, especially in digital. The only limitation in your situation is the size of the antenna. When going indoors most people get a twice the antenna that we would need outdoor to make up for the loss. At 30 miles that would be the
Channel Master CM3679, which would be much too big. Even the
3016, which is one of our smallest tradional style antennas would be too big.
Even if the antenna is a bit undersize for the mileage, it would have to be better than those cheap indoor antennas. If you can put an antenna on your balcony, the
CM3010 Stealthtenna would work great.
If you are limited to 4 feet width, we do have antenna that is 6.5 inches wide but about 46.5 long. It is the
Winegard Sensar III GS1100 Hopefully this will do, in fact I can't find anything smaller. It has great VHF and sure get CBS.
-Mike