The "Arrow" dual band Jpole antenna is made from 3/8" aluminum solid rod. As of April of 2014 Joseph Fazzio, an industrial supplier in southern NJ was selling a 12' length for a little more than $4. The base is 1.5" x 1.5" 3/16" aluminum "L" channel. The same vendor sold a 60" length for about $6. The coax connection is made via a 3/8" to S0-239 stud adapter that is available on Ebay for less than $3. 3/8-24" stainless steel "jam nuts" are the best choice. They are inexpensive and available online at where else but Ebay.

Make sure the elements are always parallel to each other. It's easy to accidentally bend the rods during construction so try to keep them straight and when all is bolted together everything will be in line. The second is a suggestion about keeping things bolted together. Adding a dab of no-ox to the threads will keep the stainless and the aluminum from becoming oxidized and forever locked together. After snugging and NOT overtightening the jam nuts apply a dropor two of Locktite where the threads meet the jam nuts.

	The mounting bracket is made from 1.5" aluminum "L" stock that's 3/16' thick. The first two holes are 21/64" that allows them to be tapped to a 3/8-24 thread. The hole for the 3/8'-24 stud to S0-239 adapter is 1/2" in diameter.
	Two 5/16" holes are needed to attach the bracket to a standard antenna mast. They 1.5" apart, centered on the bracket both vertically and horizontally. A PDF of the bracket is HERE.

The next element length has no take into account the inch and a quarter length of the 3/8 stud including a securing jam nut. The total exposed legth is 19 1/2". You may have seen and read elsewhere that this dimension is supposed to be 19 1/4". I did the build and made the measurements. My setup required the 19 1/2" to make the bandwidth centered. The tip to tip length is 18 3/4". The bottom 3/4" is threaded as 3/8-24.

The shortest element's exposed length is 6 1/4". Adding 3/4" to allow for the jam nuts and the thickness of the bracket makes the tip to tip legth 7".

The mast attachment is a 1 1/2" antenna bracket that is sold at Radio Shack as well as many vendors on Ebay.

Testing the antenna was done with the help of an old 12' fiberglass tree pruning pole with the busniess end removed. and the help of a 4' fiberglass ladder. I connected a 20' length of RG58 cable and attempted to make an ugly balun.... not worth the effort. VHF and UHF frequencies make the attempt null. I suppose ferrite chokes of the proper type may be a much better choice. VSWR for two meters was under 1.5:1 for the entire band with a 2:1 bandwidth of about 10 Mhz. The 70cm VSWR bottomed out at 1.3:1 and that tweak was done with playing with the small element's length and the 19 1/2".