A j-pole antenna for GMRS/FRS frequencies (462.550MHz – 467.725MHz)
This article will outline how to build a j-pole antenna for the GMRS/FRS radios. These radios are the type you can buy at sporting goods stores such as REI, Cabelas, etc. There are several radio manufacturers who make GMRS/FRS radios with removable antennas. This antenna can increase the range of these radios by miles!
NOTE: 1) You can only use this antenna with GMRS or GMRS/FRS combo radios which are built with removable antenna (you cannot use this antenna on or modify an FRS-only radio or as I understand it, GMRS/FRS radios which do not have a removable antenna). 2) You need an FCC license to use GMRS radios in the US (read the packaging on the radios you get for more info). Know your local laws to make sure it’s legal to use this antenna before building it!
WARNING: Torches, soldering irons and solder (especially, silver solder) are very HOT. Be very careful while building this antenna! Always wear safety goggles and other appropriate safety equipment.