Yes these Masts at Swingate are part of Chain Home Link.
binky9 is right,in game the Masts are parallel to the coast and if I am not mistaken they are behind
Dover castle.
The Masts in Game also seem to be Hardcoded so no way of Correcting [might be wrong though]
Looks like there was also a Fourth Radar Mast [Footings Circled]
