of at least 50 kilowatts and operate with directional antennas. The antennas are required to be designed and operated so that the radiated power in the maximum lobe toward the specific zone or area of reception intended to be served is at least ten times the average power from the antenna in the horizontal plane. See 47 C.F.R. §§ 73.751, 73.753. We observe that most of our HFBC licensees operate transmitters at either 100 kilowatts or 500 kilowatts. See 47 C.F.R. § 2.102(h)(3)(iii). This and other special provisions regarding non-Federal Government use of spectrum allocated to the fixed and land mobile services below 25 MHz were adopted shortly after WARC-79 and these provisions are codified at 47 C.F.R. § 2.102(h). Even