I'd use a two antenna system.
Facing south, a 4-bay panel antenna for UHF reception, an Antennas Direct DB-4 for example. The second, an Antennacraft Y5713 pointing at about 50° which will offer reception of WMUR and WENH.
The two antennas can combine into one coax with a
UVSJ.
Given only one tuner, I don't think any amplifier will be needed... in fact, the possibility of overloading recommends you avoid an amplifier.
I would strongly favor outdoor mounting of the UHF antenna. Attic mounting of the high-VHF would likely work unless your roof accumulates significant snow load.