The WIFI in my car is only 5Ghz. I am looking for a DMR hotspot that supports 5Ghz WIFI, but all I can find are hotspots that support 2Ghz. Can anyone recommend one that supports 5Ghz WIFI?
I believe only the PI3. 4 and 5 support 5ghz.. this is based on memory, and could be more that do.. Your selected hotspot should be built from there.. As for "branded" hotspots I have no idea. Unfortunately the Pi 0w and Pi0w 2 are only 1.2ghz wifi.
You didn't say what kind of Hotspot you have? I've had several RPI 0 / MMDVM boards and always ran them through wired eithernet dongle. Perhaps you can find a 5gb wifi dongle that would work for you.