I have stated before and here again, I shall. Outside antennas, as high as practicable are the better antennas for receiving line-of-sight transmissions. If you must have one inside, you will have degradation in signals. You don't need to build a ninety foot tower, although that would be nice to have, a five foot mast on a vent pipe mount will help tremendously over anything indoors. The other disadvantage with indoor antennas is, when it rains, there is further degradation. You can get by with a radio mounted antenna, but believe me, put antennas outside for best results.