This is posted on www.zero13wireless.net/foro/ from sushisan
This can be a replacement for coax baluns used in Amos antennas.
There is also very interesting pdf file on site.
Actually this is part of a dipole printed on fr4 plate but without dipole.
May be can be madded like NHC 21DBI dipole?
And here something similar : www.digdice.com/2007/09/28/sector-antenna-grad2487/