[lawlessone]

Do they work during the day or does the scattering and sunlight also make that impossible?

[tomr_stargazer]

Yes! Radio astronomy at most frequencies is totally feasible 24 hours a day, as long as you’re not pointing too close to the Sun. Source: I’m a radio astronomer.

[empyrrhicist]

I'm not the right person to ask. I'm guessing the EM environment is too noisy, but who knows.