After several days of hard thinking and a lot of soldering, it is time to bring the stuff to the plane and try it out. It worked nicely and I was able to hear the tower clearly from inside the metal hangar. The tower was pleased with my transmitting also.
I am trying out the wonder- whip antenna. It is a dipole- antenna made of only a coax cable. It is described here: http://www.xplorer.co.za/wonder-whip/index.html