Under what circumstances may a dealer sell an external RF power amplifier capable of operation below 144 MHz if it has not been granted FCC certification?

The FCC strictly regulates the commercial sale of external RF power amplifiers capable of operating below 144 MHz. This is primarily to prevent such amplifiers from being used illegally by Citizens Band (CB) operators on the 11-meter band. Commercial manufacturers must get these amplifiers certified to ensure they cannot easily be misused. However, the FCC provides a specific exemption for the amateur radio community's tradition of homebrewing. A commercial dealer is legally allowed to buy and resell an uncertificated amplifier if it was originally constructed or modified by an amateur radio operator specifically for use at an amateur station. Options mentioning reciprocal agreements or dealer-assembled kits do not bypass this certification requirement.