The active receiving antenna, an appropriate element for HF-radio reception

New techniques of highly linear and low noise amplifier circuits provide extremely broadband active antennas and antenna couplers for application in HF-VHF receiving systems. The undesired frequency dependence of the performance of antennas mounted on masts can be effectively suppressed by the use of small active loop antennas. By multiple use of the diversity-antennas in combination with appropriate circuit devices the decoupling from the mast can also be obtained with active electric dipoles. Therefore antennas of this kind being mounted upon masts of appropriate heights are highly qualified elements for application in antenna arrays