A planar antenna, comprising: a substrate; a ground plane extending in a first direction on the substrate; a radiating element coupled to and electrically connected to the ground plane on the substrate, said radiating element defined by a first portion extending in a substantially perpendicular direction from the ground plane, and a second portion extending substantially perpendicular from said first portion of the radiating element, said radiating element having a length that defines a resonant frequency of the planar antenna; a feed line coupled to the radiating element, the feed line disposed between the second portion of the radiating element and the ground plane, the coupling defining an impedance tap point along a length of the radiating element; a first frequency adjustment section disposed along a length of the radiating element, the first frequency adjustment section including at least one pair of first contacts separated by a first gap, wherein coupling of the at least one pair of first contacts adjusts the length of the radiating element and consequently a resonant frequency of the planar antenna; and an impedance adjustment mechanism disposed between the feed line and the first portion of the radiating element and arranged to adjust an impedance of the planar antenna, the impedance adjustment mechanism comprising at least one impedance adjustment section that each include a pair of contacts separated by a gap, wherein one contact of the pair of contacts is coupled to the radiating element and another contact of the pair of contacts is coupled to the feed line, wherein electrically connecting the pair of contacts adjusts the impedance of the planar antenna. a substrate; a ground plane extending in a first direction on the substrate; a radiating element coupled to and electrically connected to the ground plane on the substrate, said radiating element defined by a first portion extending in a substantially perpendicular direction from the ground plane, and a second portion extending substantially perpendicular from said first portion of the radiating element, said radiating element having a length that defines a resonant frequency of the planar antenna; a feed line coupled to the radiating element, the feed line disposed between the second portion of the radiating element and the ground plane, the coupling defining an impedance tap point along a length of the radiating element; a first frequency adjustment section disposed along a length of the radiating element, the first frequency adjustment section including at least one pair of first contacts separated by a first gap, wherein coupling of the at least one pair of first contacts adjusts the length of the radiating element and consequently a resonant frequency of the planar antenna; and an impedance adjustment mechanism disposed between the feed line and the first portion of the radiating element and arranged to adjust an impedance of the planar antenna, the impedance adjustment mechanism comprising at least one impedance adjustment section that each include a pair of contacts separated by a gap, wherein one contact of the pair of contacts is coupled to the radiating element and another contact of the pair of contacts is coupled to the feed line, wherein electrically connecting the pair of contacts adjusts the impedance of the planar antenna.