I can’t speak to the quality of these bnc adapters but this is pretty much what you are looking for. Sometimes you can find better pricing on a whole bundle of adapters, but often there will be adapters you don’t need in the mix. You could also skip the bnc adapters and just use a “uhf female to sma female” but it’s not a quick connect/disconnect solution and you’d have to screw it on or off every time.

DHT Electronics 2pcs RF coaxial Coax Adapter SMA Female to BNC Female https://www.amazon.com/dp/B00CVQJRUA/ref=cm_sw_r_cp_api_glt_fabc_RFJFP2VX9Q8D1NMF2Y5N

DHT Electronics 2pcs RF coaxial coax adapter BNC male to UHF female SO-239 SO239 https://www.amazon.com/dp/B00CW5JT58/ref=cm_sw_r_cp_api_glt_fabc_6A39M3ZZ6CW01GZXZ3T3

DHT Electronics 2pcs RF coaxial Coax Adapter SMA Female to UHF Female SO-239 SO239 https://www.amazon.com/dp/B00CVQP7CW/ref=cm_sw_r_cp_api_glt_fabc_3TZTHW3CCP14BNFR67T2

Tram 1235 3 1/4" Magnet with NMO Mounting, 17ft Cable with PL-259, Gold https://www.amazon.com/dp/B01K4R31QS/ref=cm_sw_r_cp_api_glt_fabc_246GR1XPTTFDA0HQ28GP

1126-B Antenna Tram Black UHF 1/4 wave NMO Pre Tuned 410-490Mhz Antenna Motorola Kenwood Icom Vertex Blackbox HYT Hytera Mobile Radios https://www.amazon.com/dp/B00L9D2N6Q/ref=cm_sw_r_cp_api_glt_fabc_MZDCHZ51BPQ50YQ2AD1M

Lots of good suggestions so far. I've got a couple of qrpguys antenna kits I'm looking forward to putting together including an endfed.

Whatever you go with for an antenna I would suggest buying a couple different lengths of coax and some rf adapters. Might want a binding post and some wire just to have it onhand as well. There is nothing more frustrating than not being able to use the new toys.