Byron A Jeff wrote:

> May need to see about licensing some higher powered radios though.

  No way!  You're not an RF designer are you?  The solution to this is
to use the same low-powered RF modules, but to use an antenna on each.

  3 elements (radiator, reflector and director) will give substantial
gain, but will do you two *really big* favours - they will reduce the
likelihood of interfering with any other system (TX antenna), and reduce
the likelihood something else will interfere with you (RX antenna)!
--
  Cheers,
        Paul B.