In 2009 I bought myself 4 antenna's from
I0JXX the 25 elements 70 cm beam
After unpacking my first impression was that the antenna was nice build and looking fine. I started assembling the antenna.
After my first antenna was assembled I wanted to measure the return loss but then I found it impossible to get a good and stable return loss.
After some more measurements I found that the balun was not working as it should and that there were strong RF currents on the outer coax cable. This was clearly visible when I moved my hands over the coax cable, even well outside the hot radiation area of the dipole.
I contacted the distributor were I bought the antenna and after some more e-mails exchange I became in contact with I0JXX. Conversation with I0JXX was constructive but very difficult.
After I received some new dipole feeds I decided to open it up to see how it was constructed. This was a hard job because its filled with resin which is very strong.
With some brute force and patience to be sure not to damage the construction I realised to open the dipole feed construction. After it was opened I found the problem why the balun from the antenna was not working. It was manufactured like it was an HF antenna. For a 70 cm antenna this construction is absolute no good.