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-- The speed of radio in air is the same as the speed of light in air.

-- That in turn depends on the temperature, pressure, and humidity of the air.

-- At 'STP' (standard temperature and pressure) the refractive index of air

is listed as 1.00027.

So the speed of light/radio would be 99.972% of the speed in vacuum.

That's 299,711,536 meters per second, down from 299,792,458 in space.

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