Quadrifilar antenna

An antenna comprising:

• a plurality of conductive elements, said plurality of conductive elements defining a plurality of helical pairs along a substrate having a first extending tab at one end and defining a first alignment slot at an opposite end wherein when said substrate is rolled said first extending tab is inserted into said first aligmnent slot defining a cylinder of constant radius,
• said helical pairs each having a different electrical length and electrically open at a first end and electrically connected to each other at a second end through a printed circuit board defining a second pair of alignment slots to receive a second pair of alignment tabs defined by said substrate wherein one of said second alignment slots is slightly longer then the other said second alignment slot and one of said second alignment tabs is slightly longer then the other of said second alignment tabs wherein when said substrate is placed upon said board said second alignment tabs are inserted into said second alignment slots for impedance matching said conductive elements;
• and
• a feed line electrically connected to at least one of said conductive elements at a tap point and electrically connected to a capacitive element at an opposite end, said feed line having a shape and position to perform impedance matching, wherein said electrical connections and said feed line perform impedance matching, electrical phasing, coupling and power distribution.