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 (222-1) disposed along a length of the radiating element , the first frequency adjustment section (222-1) 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 (222-1) disposed along a length of the radiating element , the first frequency adjustment section (222-1) 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 . <EOS>