Actual radar 'sets' haven't changed a great deal over the decades. How the information is extracted and presented is what changes. Someone still has to look at the display and decide what they are looking at. Type 21 Frigates are fitted with a 992 set ,this is used for both surface and air contacts. It was introduced just after the war on Destroyers and with various upgrades to it's electronics (the biggest being a switch from valves to solid state circuits in the late 70s) it is still in use today.
What I am getting at with all this Radar talk is that just because a UFO report says that a military radar had a contact doesn't mean it's real because the equipment is modern or hi-tech' At the heart of the system is exactly the same gear as used in WW2 with the same limitations and room for errors.
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