A unidirectional antenna, each of whose sides is equal to half a wavelength and which is terminated in a resistance equal to its characteristic impedance
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A bidirectional antenna open at the end opposite that to which the transmission line is connected and with each side approximately equal to one wavelength
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An antenna with an LC network at each vertex (other than that to which the transmission line is connected) tuned to resonate at the operating frequency
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A high-frequency antenna, each of whose sides contains traps for changing the resonance to match the band in use