Hello there,
hope this is the correct category. I have a PBE-M2-400 inbounding and found out that it's supported by OpenWRT. Short question, as I couldn't find a thing anywhere: Does this antenna support frequencies in the 2362-2397 MHz range with OpenWRT? I plan on using it for "HAMnet" access which operates on ham radio frequencies.
tia es 73,
Lukas
Short answer, no.
There is no long answer...
...only a veeeery long one, which involves you doing all the work - and as it's not a legal process (unless you're a certified ham radio operator) it's not a topic here either - and that's before considering hardware capabilities.
Be aware that this is an 8/64 device and does not meet minimum system requirements for upcoming OpenWrt releases (minimum requirements 16/128).
Thanks for your help. Yes, I am a ham radio operator and DK4AMF is my callsign 
I've been full of hope that the firmware was capable but in this case I don't need to FAFO with this one. 
Well, OpenWrt can't check if you're allowed to use those frequencies, so it must reject them. That aside, linux itself doesn't know about those frequencies either and can't tune into them anyways (and would reject them, even if it did know about those channels), quite a few patches would be needed to make it work. Most hardware will not do it anyways (especially modern hardware won't) or operate at/ beyond its limits.
In general, OpenWrt only allows what is legally possible without special licenses by anyone, but in this particular case, literally everything is missing (upstream linux) to do this.
Umm...there is a licensed-mode with the original firmware, that can't check either but lets you run it on 2.3GHz 
That's up to the OEM, with their proprietary firmware and proprietary kernel.
For OpenWrt, all devices (at least of a common target) are treated the same. Mainline linux only knows about unlicensed channels and rejects frequencies outside of this roaster. Neither mac80211, crda/ wireless-regdb nor ath9k support it.