diplexers, cool. If you end up trying this, please let us know how it goes, That would be an interesting and convienent set up.
My sat view misses most everything to the south and I have dreamt up a scheme for a remote 'receiving station' before that would utilize something like this:
http://www.sadoun.com/Sat/Products/T...ransmitter.htm
It would require a water-proof container and a nearby electrical source.