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EMI - The FAA's determination of no hazard to air navigation may be based on the assumption that transmitting equipment on an antenna structure meets only minimum FCC standards for spurious emissions. This means that prior to beginning any transmissions from the facility, there must be contact with the FAA spectrum management officer(s) to arrange procedures to verify that no interference is caused. There may be a need to deploy extra filtering or take other measures if transmission disrupts other services.