OK, determine dimensions for a dipole for the frequency you wish... for 10 meters should be about 16-17ft.
This is the driven element.
Add 5 percent to length and space it about .2 wavelength away, this is the reflector.
Subtract 5 percent from the length and space it about .1 wavelength opposite, this is the reflector.
Since you are unsure of the impedance, feed the driven element with twin lead or ladder line and run it to a tuner. Tune for 1:1 VSWR.
The only question is where to point it... north, east, south or west. Knowing when you will be operating will help here!
Vertical polarization will keep the signal radiating at a low angle.
-Mike.