By using 6 mm diameter solid copper wire you will get quite a nice bandwith and the whole quad will be self supporting.
There is no impedance converter needed you can solder the 50 ohm coax directly to the points a&b.
The hybrid quad without reflector has about 4 dBd gain. If you add a solid or mesh reflector at a distance of approx. 15cm behind the quad your gain will increase to 6 dBd !!!
I suggest to build a simple wood frame and fix some metalic mesh on it or to use a solid metal plate for the construction of a suitable reflector. The reflector can have a square or rectangular shape (like the white area behind the hybrid quad in the picture above)
The polarisation of this antenna is linear. When used as in the piture above the polarisation is horizontal and when turned 90 degrees the polarisation will be vertical. Experience has shown that receiving circular signals (as from FLTSATCOM) with a linear antenna will give best results with vertical polarisation.
However you should add a low noise reception-preamplifier for better reception of weak signals
The quad only - without reflector - can be made in 15 minutes as a "quicky" project.....!!!
