Everything you need, up on the roof.
Four screens. No jargon. Made for standing on a ladder with one hand free.
Point
Hold it flat. Turn until the arrow points up.
It measures from where you're standing, tells you which way to turn and how far, and says when you're on it. Then aim the aerial the way the phone faces.

Transmitters
Every option, ranked by the signal you'd get.
Main sites first, then local infills and repeaters, each with distance, bearing and expected strength. If a hill blocks the obvious one, the next best is right there.

Channels
Channels, power and which way to mount it.
VHF or UHF, kilowatts, and horizontal or vertical. Mounting the aerial the wrong way round can cost you most of the signal.

Map
Every site around you, on a map.
See where the towers actually are, then tap one to aim at it.
