The Enforcement Bureau recently took several actions against companies for operating devices that caused interference to the terminal doppler weather radar station operated by the Federal Aviation Administration (FAA) in San Juan, Puerto Rico, collectively proposing almost $100,000 in fines. The FAA uses terminal doppler weather radar, operating in the 5.60 – 5.65 GHz band, to warn pilots of hazardous weather conditions that could affect—or even threaten—aircraft arriving at, or departing from, airports in the continental United States and in Puerto Rico.