[hatsunearu]

One more thing that the average hacker should know about radio regulation:

You can homebrew a radio yourself and it doesn't need FCC approval if you're a ham operating on ham bands with all the appropriate standards.

You are however not allowed to sell radios at a commercial scale unless it's FCC approved, even if it's for hams. But I think (IANAL) you're allowed to sell homebrew gear in like garage sale-type deals.