Reddit reviews Tram 1239 PL259 UHF Connector & 1126 UHF Antenna 1/4 wave NMO Pre Tuned 410-490 Mhz 3 and 1/4" Magnet Mount NMO Mag Mount 17 foot Antenna Cable
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Pre Tuned 410-490 MhzYaesu Kenwood HYT Vertex Icom Mobile Radios
Just about Any uhf mag mount should work. The photos you linked, looks like it has a uhf connector. This is also known as a so-239. If that's the case, you need an antenna with a pl -259 connector. This should work:
https://www.amazon.com/Tram-Connector-Antenna-410-490-Magnet/dp/B01976NIB0/ref=sr_1_2?ie=UTF8&qid=1467773359