Line of Sight Propagation
From HFUnderground
Line of sight propagation or LOS is the primary form of VHF/UHF/SHF frequencies but can be (and often is) the primary form of propagation for land mobile two-way radio systems operating in the high HF region (broadly 24-30 MHz or so, usually 25-30 MHz, i.e. the 11 meter band and the various 26 MHz/27 MHz CB allocations worldwide.
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