Using a shorting bar, short out the reflector stub until you get the least signal. You are now tuned for maximum front to back ratio . Open and Close the band with the Gem quad design , Full wave performance. High quality construction using 6061-T6 Aluminum , Stainless steel hardware and non corrosive fibreglass. Quiet DX reception, reduced precipitation noise.
Quads are less vulnerable to lightning strikes and static then a yagi.
Tridetic arms give excellent strength and less wind resistance then solid arms Element for Element and dollar for dollar the Gem Quad antennae offers more gain and general overall performance.