Antenna with elements pivotally connected to boom

Claim 1

FOR USE IN AN ANTENNA, A BASE MEMBER AND A CAP MEMBER POSITIONED ON AND PIVOTALLY CONNECTED TO SAID BASE MEMBER, SAID BASE MEMBER HAVING A FLAT METAL PLATE PORTION WITH A FLAT SURFACE WHICH FACES TOWARD SAID CAP MEMBER, SAID PLATE PORTION HAVING OPPOSITE LONGITUDINAL EDGES AND OPPOSITE END PORTIONS, TWO STRENGTHENING AND REINFORCING FLANGE PORTIONS INTEGRALLY JOINED TO SAID PLATE PORTION ADJACENT TO SAID OPPOSITE EDGES, RESPECTIVELY, AND EXTENDING GENERALLY PERPENDICULARLY AWAY FROM SAID PLATE PORTION AND SAID CAP MEMBER, SAID FLANGE PORTIONS HAVING OPPOSITELY AND OUTWARDLY FACING CAMMING SURFACES, RESPECTIVELY, JOINING SAID PLATE SURFACE AT SAID LONGITUDINAL EDGES, SAID CAMMING SURFACES BEING ROUNDED AND SMOOTHLY MERGING WITH SAID FLAT SURFACE AND SAID FLANGES WHEREBY SAID CAMMING SURFACES AND SAID PLATE SURFACE ARE CONTINUOUS, SAID END PORTIONS EXTENDING GENERALLY PERPENDICULARLY AWAY FROM SAID PLATE PORTION IN THE SAME DIRECTION AND BEYOND SAID FLANGE PORTIONS EACH OF SAID END PORTIONS HAVING A PART-CYLINDRICAL SURFACE SPACED FROM SAID PLATE PORTION, SAID PLATE PORTION HAVING AN INDENTATION THEREIN DEFINED BY OPPOSITELY FACING AND UPSTANDING ABUTMENT SURFACES, AND PIN MEANS EXTENDING THROUGH SAID CAP MEM-