Antenna for 40 Meters

Antenna for 40 Meters

Antenna: 40 meters, Range: 7.0 to 7.3 MHz

Good 40 meters antennas are easy to build with nothing more than readily available materials. Since 40 meters covers the frequency range of 7.0 to 7.3 MHz you can use a few algebraic formulas to compute antenna sizes.

Antennas for 40 meters are used as verticals and dipoles with great success. 40 meters antennas are a bit large as verticals but dipoles for 40 meters are quite manageable. A dipole for 40 meters can easily be strung between two tall trees located near a survivalist camp.

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 40 meters is approximately 32 feet 6 and 9/32 inches in length. This antenna measurement can be used for either a vertical antenna for 40 meters or a horizontal antenna for 40 meters.

Propagation is very good on 40 meters for local and DX work. Intercontinental contacts are very common on voice, Morse code and the digital modes. Of all the bands available it might be said that 40 meters is the most versatile.

40 meter antenna

Vertical Ham Radio Antennas

Vertical Ham Radio Antennas

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 Vertical Ham Radio Antennasself-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.