Different categories of antennas
They are intended to be installed on vehicles, the metal body as a ground plane. They can be magnetic (instant installation and removal, theft failure, etc.), or fixed by drilling (long-term installation). The first mentioned require a verification, or possibly an adjustment of the SWR after each repositioning, which is not the case for the fixed antennas by drilling. Must be fixed to the vehicle where there is a maximum of metal surface (ground plane), away from windscreen mountings. If you already have a radio-telephone antenna installed, the CB antenna should be higher than this.
Fixed antennas are mainly intended to be installed on the roof of a building. These are sometimes equipped with radiants acting as a ground plane. Make sure it is installed in as clear space as possible. If it is fixed to a mast, it may be necessary to install guy-wires, according to the laws in force (you should seek professional advice). For an antenna which must be fixed by drilling, you will need a good contact between the antenna and the ground plane. To obtain this, you should slightly scratch the surface where the screw and tightening star are to be placed. Be careful not to pinch or flatten the coaxial cable (as this runs the risk of break down and/or short-circuiting).
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