Island antenna for installation on aircraft

Claim 1

IN COMBINATION WITH A CONDUCTIVE AIRFOIL HAVING OPPOSITE GENERALLY PARALLEL CONDUCTIVE SURFACES IN AN AIRCRAFT, A PAIR OF SUBSTANTIALLY PARALLELLY ALIGNED ANTENNAS ONE MOUNTED IN EACH SURFACE OF SAID AIRFOIL, SAID ANTENNAS HAVING ALIGNED RECTANGULAR CONDUCTIVE SHEETS, MEANS FORMING A DIELECTRIC GAP OF UNIFORM WIDTH ABOUT EACH SHEET IN THE PLANE OF THE RESPECTIVE AIRFOIL SURFACE HAVING A LENGTH DIMENSION OF BETWEEN A HALF AND A WHOLE WAVE LENGTH IN THE RANGE OF THE OPERATING FREQUENCY, A PAIR OF COAXIAL LINES ONE EACH FEEDING SAID ANTENNA ACROSS SAID GAP AT CORRESPONDING POSITIONS IN A PLANE DIVIDING SAID RECTANGULAR SHEETS INTO CONGRUENT RECTANGLES, EACH OF SAID POSITIONS DEFINED BY A PAIR OF FEEDPOINTS ON OPPOSITE SIDES OF AND IMMEDIATELY ADJACENT TO SAID GAP, WHEREBY AN ADDITIVE RADIATION FIELD MAY BE OBTAINED IN THE PLANE OF SAID AIRFOIL POLARIZED GENERALLY PARALLEL TO SAID PLANE, A BALUN HAVING FIRST AND SECOND BALANCED TERMINALS, AN UNBALANCED TERMINAL AND A PLURALITY OF REFERENCE TERMINALS WITH MEANS FOR MAINTAINING SAID REFERENCE TERMINALS AT A COMMON POTENTIAL, FIRST AND SECOND UNBALANCED TRANSMISSION LINES COUPLING A RESPECTIVE ONE OF SAID ANTENNAS BETWEEN A RESPECTIVE BALANCED AND UNBALANCED TERMINAL, AND A THIRD UNBALANCED TRANSMISSION LINE FOR EXCHANGING ENERGY WITH SAID UNBALANCED TERMINAL.