Since the question was how many, not what...
Not counting donors and parts, 29 working radios - CB, export, 10M-12M, Amateur. Most of the CB, export, and some 10M radios are in need of being recapped. WIP, started with the oldest, working forward.
I run:
Base:
HF = 1 200w HF + 6meter full time on HF antennas
CB = Rotate between 5 40 ch CB SSB bases 1 week at a time on 11M antennas
10-12M mobile = Rotate between 9 radios (mostly for mic checks) on HF and 11M antennas.
Mobile:
HF = 1 200w HF + 6meter full time on multiband HF antenna
CB = 2 rotate with 10M mobiles on GoldenRod 45 antenna
10-12M mobile = Rotate between 9 on multiband HF & GR45
Looks like I "run" 18 radios.
Too many radios, not enough time...