Electromagnetic Field Theory
The transmitting antennas for lower frequencies (below 500 kHz) are generally

Any of the above
Horizontal suspended wire type
Parabolic reflector type
Vertical grounded wire type

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Electromagnetic Field Theory
Which of the following statement regarding waveguides is incorrect?

At waveguide can be coupled to a coaxial cable
At frequencies below the cut off value the wave progresses across the waveguide after total reflections
Waveguides are usually air filled hollow conducting metallic tubes for transmitting UHF and microwaves
Waveguides can handle large power at UHF and microwaves

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