Yes indeed, there were originally four steel transmitting towers each with an array of wire aerials strung between the huge platforms at the top of the masts and half way down. The aerial arrays on each tower were tuned to a specific frequency so that transmission could instantly be shifted to a different frequency if the Germans started jamming the one in use. There were four wooden towers over towards St Margarets supporting the receiving aerials. The photo below is one taken with a massive zoom lens by a German photographic unit over on the French coast.
We discussed the Chain Home radar station at some length a couple of years ago when the third mast was pulled down, see thread below. Without looking it up, would think the fourth mast was demolished some time in the fifties. The Chain Home system was old technology by the end of the war and the Swingate radar was replaced by a massive rotating scanner at St Margarets during the Cold War. The old towers have been used since the war by the MOD and for FM radio but the remaining two are living on borrowed time.
http://www.doverforum.com/letters/viewtopic.php?id=3974&p=1