[GroundUrMast]

Because the FVHD45 and ...30 are smaller, they lack support for reception of real channel 2, WLBZ. If you don't care to receive NBC programing, then those antennas may be appropriate.

Here's a screen shot of the Net NM estimate for WLBZ using the HD7015P. A Net NM in excess of 15 dB gives me confidence that you'll have reliable reception.

If you choose an antenna with no designed support for reception of real channel 2, it's not unreasonable to estimate the effective gain to be in the range of -15 to -25 dBd. If that's the case, you would end up with a negative net NM which predicts reception failure.