A cable television antenna is constructed so that a cross section along its axis is a parabola with the receiver at the focus . Find the focus if the antenna 12 meters across and its deep 4 meters .
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At the microwave frequencies used in many parabolic antennas, waveguide is required to conduct the microwaves between the feed antenna and transmitter or receiver. ... Some parabolic antennas transmit or receive at multiple frequencies by having several feed antennas mounted at the focal point, close together.
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