# Antennas for 15 Meters

## Antennas for 15 Meters

### Antenna: 15 meters, Range: 21 to 21.45 MHz

Good 15 meters antennas are easy to build with nothing more than readily available materials. Since 15 meters covers the frequency range of 21 to 21.45 MHz you can use a few algebraic formulas to compute antenna sizes.

In the case of antennas for 15 meters you can see the antenna size begin to increase but not too large. A survivalist can make good use of a dipole antennas for 15 meters. A dipole is nothing more than taking the whole length of wire and cutting it in half. Each piece is separated with the shield of the coaxial cable connected to one wire end while the center conductor of the coax is connected to the other. Dipole antennas for 15 meters are easy to deploy as you can throw a couple of ropes up into trees or other structures and pull the antenna up and out of the way.

This formula: 234/f can be explained by dividing 234 by the desired frequency in megahertz which will give you the length, in feet, of a 1/4 wave antenna. This formula isn’t exact in that it assumes the radiating element is infinitely small. What this means is if the radiating element was one inch in diameter then the resonant length of the antenna would be a little shorter than the calculated one given by the formula gives you.

Using the formula above you will soon see that an antenna for 15 meters is approximately 11 feet 15/32 inches in length. This antenna measurement can be used for either a vertical antenna for 15 meters or a horizontal antenna for 15 meters.

15 meters is a great band and could be pressed into service for either day or night time use depending upon the current sunspot cycle.

### Related posts:

Vertical Ham Radio Antennas love ’em or hate ’em they are still a viable antenna for use in either two-way communications or simple shortwave listening. Why the bad press for verticals? Well to be honest some verticals really aren’t all they are cracked up to be. Claims made by the designers and/or manufacturers simply don’t hold up when the antennas are put into action. Many amateur radio operators put up vertical antennas in a hurry and tend to skip important considerations set forth by the manufacturer. Once the antenna is up it naturally works in a substandard fashion and the operator generally blames the vertical antenna instead of the fashion in which it was installed.

#### Vertical Antenna Types

You can’t really have more than one way to erect a vertical antenna and that is in a vertical position. But there are quite a few different types of vertical antennas:

• Base vertical antennas
• Mobile vertical antennas
• Portable vertical antennas
• Wire vertical antennas
• Towers and structures as vertical antennas

#### What’s Best For A Survivalist?

Someone on the move will grab their bug out bag and their emergency radio kit complete with radios and an antenna system of some sort. There are many ways to build a vertical antenna but a survivalist must think of weight and ease of assembly. The picture to the right is an example of a self-contained antenna system ready to travel. In this case you merely find a good location for your vertical antenna, assemble the pieces shown above, connect the feedline to your radio and you are in business.