> looked up a little on K (18-27Ghz) and Ka band (26.5-40Ghz), but both seem to be still unfeasible for long range communications umm, Ka band is rather popula

> looked up a little on K (18-27Ghz) and Ka band (26.5-40Ghz), but both seem to be still unfeasible for long range communications umm, Ka band is rather popular for satellite communications (very long range by most standards!). Yes things like L band are great for propagation and penetration, but the fundamental motivation for going to higher frequencies is that they can carry more data. This is the same reason you don't get music on AM radio--there's not enough bandwidth for good sound quality.