hi,
using two or more antennas, and using different frequencies -
why should it not be possible ?? its done all the time even in fm broadcast if you take care of your bandwith - in broadcast they sometimes use an additional guard band in between etc-
otherwise using one frequency on more than one antenna is done
e.g with stacked antennas !
the big problem is - it needs an octopus to handle
all that stuff manually
mac