# Antennas

### Explanation of question 19

A vertical end-fed antenna for the 21MHz band is of length 3.35m. Its input impedance will be approximately

1. 50
2. 100
3. 150
4. 300

The answer is :- 1 f = 21 225 ,where 21.225 is the centre frequency of the 21 MHz band. Thus = 6.7 m and 3.35 m represents an end-fed antenna. The input impedance will be approximately 50

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