They were made here in Northern Indiana in Mishawaka in the 1970s and 1980s. They look like a Jo Gunn on steroids as they used a really heavy square boom and the boom to element mounting was done by a square clamp with studs welded to it.. Whne they were made they made the Jo Gunn series look like a toy!!! I know a guy who owns a 6 element and it is a HUGE heavy monster!! It uses Maco element spacing and is 31' long and weighs a WHOPPING 75 lbs!!!!! Its no longer up but he has it on the ground in pieces. Next time i get up that way ill snap some pics!!!! 
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