The J Pole, as I have done it

Moved me to my new abode, I have not wanted reinstall the pylon with all the various antennas that I had previously, so I have delighted with the construction of this j-pole of which I have so much well felt. The actual posting is that visible in this photo on the right side.

The idea

As usual, while I was being busy in some other thing in my cellar, an old antenna's book of a famous OM happens among my hands, one of the most greater instigator of mine "aerials". Skimming through the pages they returned me to the ears the words of an OM connected on a VHF relay (by a dipole made with a BNC T connector, for the old lan net!) that told me that he was using a J-pole, when all of a sudden a J sprouts on the book. So I go to the brico center and take the aluminum tube, look for other material to complete all, puts me to the work... Ended the radiator, as write on the book, I make the adapter with the coaxial cable. Enthusiasticaly I try the antenna and with regret known that the SWR is almost endless! Possible ...! I Go then on Internet and I start to looking for something to solve my problem. At the end I succeed in finding something for my case. The following measures show the final model that with SWR 1:1. radiates very well supported to the balcony. Last summer I have had the fortune to listen to some IS0 and it has been used for listening to the ISS.

The measure #2 have been taken in the middle of the aluminum pipes. I remind you that the inferior side of the antenna can directly be connected to the metallic supports. The ground of cable has been connected to the short element, while the central one of the coaxial has directly been connected to the long side of the antenna. The antenna setting can happen varying its various lengths. Optimized once the measures 1,2 and 3, I have set the SWR acting on the rod b. In case of doubts I'm to your disposition.