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Radiation Pattern and Beam Area Beam Area Directivity Power Gain Antenna Aperture Effective Area and Effective Height Oscillating Dipoles and their Fields SNR Space Temperature Cosmic Noise Antt. Impedence Maxwell's Recipe Near Field- Far Field Poynting Vector Omnidirectional Isotropic Linear Array Amplitude Spectrum Analyzer Max. Usable Frequency Min. Usable Frequency Optimum Usable Frequency hop multipath ionozation