EH TEST ANTENNA
BY W0KPH - Jack

Here is a quick and easy 20 Meter EH antenna to try out. If you would like to build it , I sure would like to hear about it. I have had excellent results with it . It is an excellent radiator. To convert to 40 meters double the length of the foil and double the size of the mailing tube. The coil will be about 20 turns. Also the spacing on the foil would be 4 inches. Double again for 80.

To put it on a PVC pole outside, I hot glued a clothes pin to the pipe, down about 6 inches from the top of the pole Slip the antenna over the pole and clip to pole with the clothes pin.

I used an old mailing tube I found in my junk box. If you buy a new one be sure that is has no metal in it. You may also use 2 inch PVC pipe, or any plastic-non conductor cylinder.

Note: Don't Leave It Out In The Rain....



Assembly



Here is what you need to build one on the kitchen table:
2 inch mailing tube about 15 inches long
2 pieces of Aluminum foil 5.5 inches X 7 inches long
#22 wire for winding the coil.
52 ohm coax and connector.
Elmers Glue

Tools: :
Hot Glue Gun
Stapler
Scissors
Knife
Something to punch hole in the Mailing Tube

How to build:
Wrap the aluminum foil around the form the 7 inch side will give some overlap. Use Elmers white glue to fasten the foil to the mailing tube. Fold the overlap together to make good contact , then Staple to tube. I stapled the #22 wire to the overlap area to make connection. The rest should be easy to understand. I have run 100 watts to this on cw and no problems. Run the wires down the inside of the tube.

Because of the small wire, the antenna will not be as efficient as one built with #12 wire. I used the small wire just to demonstrate the EH pricniple.

How To Tune
The antenna can be test tuned in the house. Tune it to 13.6 MHZ,