Reddit reviews Yagi Base Antenna UHF 450-470 MHz 6 Elements 10.2 dBd Gain, with mount, N-Female connector
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Fully Welded Yagi Antenna450-470 MHz band split6 elements, 10.2 dBd gainN female connectorpre-tuned
Is there a repeater in your area?
If so, then look at a Yagi (beam) and mount it. Something like this. Even a 5-element Yagi for GMRS frequencies is not very big. Point it at the repeater.
If there's not a repeater, then you'll want something omni-directional like a 5/8-wave ground-plane for simplex.
For coax, LMR-400 is a good choice. At UHF frequencies, you need much better coax to keep the losses down.
Sirio makes a ground-plane that's wideband enough to work on both GMRS and amateur UHF. It's only unity gain, but it might be nice to have one antenna for both if you do end up getting your amateur licence.
Depending on where you live, local ordinances can put up significant barriers to a tower -- even a 50-foot tower. It's not that uncommon for a city to require an engineering study, electrical inspections, permits, or additional insurance. They may also require licensed contractors to do the work. Check out the ordinances first.