Spider omni wireless antenna

The omni-directional antenna was built using an N-type chassis mount connector with short lengths of stiff fencing wire soldered into each corner hole. The driven element (the wire soldered into the centre, or conductor) was a quarter wavelength (32 millimetres) as was each ground plane (four soldered around the body of the connector). Each groundplane was cut to length and then bent over at 30 degrees below the horizontal to attempt to match the impedance to 50 Ohms.