At high frequencies radio waves take on the properties of light waves. They just bounce off of stuff rather than go through it. 3 and 4 GHz needs line-of-sight to really work well. The lower frequencies, such as VHF television, propagate much better through materials and depend a little less on line-of-sight. It would work better over longer distances.
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At high frequencies radio waves take on the properties of light waves. They just bounce off of stuff rather than go through it. 3 and 4 GHz needs line-of-sight to really work well. The lower frequencies, such as VHF television, propagate much better through materials and depend a little less on line-of-sight. It would work better over longer distances.