This is just a pair of 4X150s laying horizontal in a 2-perch "aluminum Martin house." One perch rotates a 270deg slider on a semi-circular grid line assy. & the other does a reflection of same for the plates. Either - a cold war jammer (Mike Hanz jump back) - final outa 225-400 mcs UHF 'base stn.' 4X150s are RCA & dated '56 & '60. Who knows the beautifully built critter?