WebDefinitions and Formulas. For a perfect sphere without any mountains, the distance d₁ from a transmitting antenna to the horizon or the line of sight, or radio horizon, can be calculated from the Pythagorean theorem (see the picture above):. where. h₁ is the transmitting antenna height above the ground,. R = 6371 km is the mean Earth radius.. Note that the … WebFree TV Channels TV Antenna Map & Technical Info Free TV Guide Listings These popular channels and more are available in the US and can be received nationwide with a TV antenna. Please enter your zip or address. Enter your …
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