So you have no clue what an ARRL Field Day is? First of all, the ARRL stands for Amateur Radio Relay League. Amateur Radio is a type of radio system and form of communication often confused with CB radio. Amateur Radio operators comply with established FCC rules, since the FCC grants us licenses after successfully passing an exam. The Amateur Radio Relay League is a non-profit organization for the networking of Ham Operators. Click the read more link to continue.