This RF system provides mask filter and channel combiner for two Low Power DTV facilities which will operate on RF Channels 16 and 18. The filters are 6-section UF3000-63 and each filter input includes a Model DC3011-2 dual port, adjustable directional coupler. The system also includes a DC3012-3 3-port adjustable directional coupler at the combined output, which is not shown. The combined output will be fed to an ERI AL PLUS™ 12-bay elliptically polarized UHF television antenna.