[ADTech]

Your topography and that line of trees to your southeast suggests that an attic antenna will have a marginal chance of success. A rooftop location is recommended.

A 4-bay UHF-only antenna is all that is needed. Because you're in the back yard of a channel 22 analog LP station, you likely will not be able to use a pre-amplifier, however, an 8-output distribution amplifier (DA) should be able to handle the situation. Keep the lead in cable from the antenna to the DA as short as you can manage.

Ground your mast and lead-in cable in accordance with local ordinances or NEC to reduce the chance of lightning damage if the antenna is installed outdoors.

There should be little difference between CATV and DTV splitters. For DTV, a 50-700 MHz splitter is all that is needed. Newer CATV splitters may be rated to 1000 MHz and may be used. Don't spend extra for them over a 700 MHz rated device, though. Do not use satellite splitters as they often have diodes in them for power steering that may interfere with signal splitting. Splitters rarely fail (unless high by lightning), so don't worry about that.