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Radio Propagation


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D-Region Absorption
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Created by PA4RM

Tom Rudzinski, SQ9FVE, made Summits on the Air (SOTA) history on February 16 by activating Aconcagua in Mendoza, Argentina. At 6,962 meters (22,841 feet) above sea level, the mountain is the highest peak in both the Southern and Western hemispheres.

An experienced and skilled mountaineer, Rudzinski planned the expedition carefully, including all necessary support. He began his ascent to the summ...

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