# Antennas

### Explanation of question 12

A dipole is of length 20.2m. Its most effective use will be on the bands

1. 15m and 80m
2. 15m and 40m
3. 10m and 40m
4. l0m and 20m

The answer is :- 2 = 20.2m f =(0.95 x 150)/20.2 therefore ~ 20 2 = 7.05 MHz. This is within the 40 m band. Equally it can be used on a frequency of 3 x 7.05 = 21.15 MHz, which is within the 15 m band.

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