Given the desire to make an attic install work, use the largest antenna that will fit in the space while still allowing correct aiming. Start by pointing directly at WFBI, about 316°.
The 'HD' series of Antennacraft all channel antennas comes to mind.
http://www.antennacraft.net/Antennas...llChannel.html Channel Master CM-3016, 3018, 3020, 3671 & 3679 are also worth considering. You have Channels in all three bands, UHF, H-VHF & L-VHF.
If you connect one TV and get good reception, but loose some channels after adding the splitter, add a Channel Master CM-3410 distribution amplifier between the antenna and splitter. The amplifier is going to do it job best if located close to the antenna.
WMAV will likely need an antenna aimed directly at it... The antenna pointed toward the NW is not likely to have much ability to receive from the side. WFBI is weak enough that the attic may prefent you from seeing it reliably... You'll simply have to try an antenna in the attic to see what you're going to get.
IMO, a premium system would be mounted outside, clear of obstructions. You could use two antennas, a Winegard HD7084P pointed at the main group of stations, and a UHF antenna such as the Antennas Direct DB8 or DB8e facing WMAV at 201°. An AC-7-E channel injector (spec'd for UHF CH-36) from tinlee.com
http://www.tinlee.com/CATV-Signal-Injector.php?active=1 would allow you to mix the outputs of the two antennas into a single down-lead. I would also equip the WMAV antenna with a Winegard LNA-200 preamp.