Distance measurement

Trying to conger up a means to measure distance from a radio tower.
Thought that maybe one could capture the time of reception of the direct wave then from a reflected wave at known distance from the antenna doing the direct capture measure the difference (shift) to know the distance from the tower. Without a unique signature, I am presuming that a computer program could be written to find where the 2 signals should have matched in order to find the difference. Is this a viable idea or have I slipped over the edge or forgotten basic physics? Dale
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