If I were in your shoes I would get the
Winegard 7694 & mount it on the roof. It should easily power 1-3 sets & eliminate any concerns with FM interference.
If some channels pixelate or dropout with 3 sets connected, I would then add the
Channel Master 3414 distribution amp; but only if needed. The 3414 will not overload with the signals at your location.
The LO VHF stations are only pushing 300 watts & the slightest bit of interference will likely make them susceptible to dropouts.(Especially overhead powerlines) Not worth the hassle IMO.