Helical antenna
![Array of four axial-mode helical antennas used as a satellite tracking-acquisition antenna, Pleumeur-Bodou, France](/Images/godic/202501/17/Traqueur_acquisition3014.JPG")
![Helical antenna: (B) Central support,(C) Coaxial cable feedline,(E) Insulating supports for the helix,(R) Reflector ground plane,(S) Helical radiating wire](/Images/godic/202501/17/Helical_antenna_principle3014.png")
![Normal-mode helical UHF TV broadcasting antenna 1954](/Images/godic/202501/17/Helical_UHF_TV_broadcast_antenna3014.jpg")
![A common form of normal-mode helical antenna is the](/Images/godic/202501/17/Uhf_cb_wit_rubber_ducky_exposed3014.jpg")
A helical antenna is an antenna consisting of a conducting wire wound in the form of a helix. In most cases, helical antennas are mounted over a ground plane. The feed line is connected between the bottom of the helix and the ground plane. Helical antennas can operate in one of two principal modes — normal mode or axial mode.