Looks like a project that Adafruit Electronics would have the capacity and experience to put together a great parts kit for. Else, ouch ... power "around 5dBm"? For those of us used to thinking in watts, that's around 0.003 w. ... of UHF.

Thanks to the availability of kits (mostly Heathkit), I got my start in Ham radio (and computing). Learned a lot - and kit prices helped me to afford that.