Helical antenna with adjustable length by switching

Claim 1

A MULTIFREQUENCY ANTENNA COMPRISING IN COMBINATION: A BASE; AN ANTENNA CONDUCTOR INSULATED FROM THE BASE AND EXTENDING THEREFROM TO DEFINE AT LEAST IN PART AN ELONGATED ENVELOPE WITH AN END REMOTE FROM THE BASE; A SHEET-LIKE CONDUCTOR EXTENDING ALONGSIDE THE ENVELOPE SUBSTANTIALLY FROM THE BASE AND AT LEAST PART OF THE DISTANCE TO SAID END OF THE ENVELOPE, SAID SHEET-LIKE CONDUCTOR HAVING AT LEAST ONE WINDOW REMOTE FROM THE BASE AND BEING ELECTRICALLY CONNECTED TO THE ANTENNA CONDUCTOR ADJACENT THE BASE, THE SHEET-LIKE CONDUCTOR EXTENDING PARTIALLY ABOUT THE PERIPHERY OF THE ENVELOPE; AND A CONDUCTOR EXTENDING FROM THE ANTENNA CONDUCTOR ADJACENT THE WINDOW THROUGH THE SAID WINDOW IN INSULATED RELATION THEREWITH; AND MEANS DISPOSED ON THE SIDE OF THE SHEET-LIKE CONDUCTOR OUTBOARD THE ANTENNA CONDUCTOR AND ADJACENT THE WINDOW AND EFFECTIVE AT WILL TO CONNECT SAID LAST CONDUCTOR TO THE SHEET-LIKE CONDUCTOR.