Abstract: The Omega-Tec Compact Mobile and Fixed Broadband Dual-Mode HF Antenna System represented is a Dual-Mode HF Mobile Antenna System composed of two subsystems. The low band unit provides NVIS high-angle communications over an operating frequency range of 2-10 MHz while the high band unit provides conventional low-angle long range communications over a frequency range of 8-30 MHz.

Abstract: Mold apparatus for the manufacture and molding of structural members such as I-beams and concrete girders which has a permanent pallet supported and maintained in a level condition by parallel beams affixed to a concrete base. The pallet is made up of a plurality of sections mounted on the beams and aligned and rigidly connected together. A pair of side forms are provided on the pallet which are readily removable and replaceable by other forms depending upon the particular structure being molded, each such form having a horizontal foundation part which extends to the edge of the pallet where a strip is welded to position the mold as desired on the pallet. The inner portion of the foundation part merges with a molding part extending upwardly in each form and terminating in an upper flange extending horizontally and outwardly at the top of the form. A plurality of vertical stiffener plates connect the various parts of each form to provide rigidity.