..you get it
Dicks, pussies and assholes
Transponders of this type don't demodulate the uplink signal. They just convert to a different frequency and amplify the downlink signal. You could do the same thing with a C-band satellite, but the hardware to operate in 4-6GHz at >100W is expensive and you need a big reflector. At UHF, you can do it at lower power with cheap parts.
1. You will have some great shadow-free images of the tops those clouds.
2. Uh, its dark.
However, radar can see through clouds and in darkness.
As the trials of life continue to take their toll, remember that there is always a future in Computer Maintenance. -- National Lampoon, "Deteriorata"