CLARRIE Shaw asks "What moon landing? (Your say, October 11) where, without proof, he doubts it really happened.

During the second World War, radio technology was sufficiently advanced to enable direction finding of the enemy's radio signals and therefore locate their position.

By the advent of public service television after the war, it was possible for TV detector vans using direction finding equipment to locate an unlicensed TV to a particular flat in a block of flats.

Further advancement using two or more detectors spaced part enabled not only directions but also distance of the signal source to be determined stereoscopically.

Given that the moon landing was in 1969 when the above technology was fully developed and also at the height of the cold war and the space race to the moon, you can rest assured that Russia monitored every emerging signal from the moon to determine its position, distance and source.

So advanced was the technology by this time that signals from a space craft merely orbiting the moon without landing could be differentiated from those originating from the moons surface.

Imagine the propaganda this would have given the Russians if the Americans had faked the moon landing.

So Clarrie that's the proof that it really did happen, as the Russians, they're not questioning it.

Paul Campbell