majoco
Stirrer
You could modify your transformer - cut all the teeny little wires and throw them out. Get two lengths of about a couple if inches of thin wire - I strip old printer cables - about 24 wires of some lovely colours - I'm assuming you have a little binocular core. Take one bit of wire and go in one hole - turn around and come out the other - now go back in the first hole and out the other. Equalise the lengths so that the ends sticking out are about the same length - you now have a two-turn winding. Repeat for the other bit of wire except go in from the other side. Solder one winding to the the dipole elements and the other to your coax cable - shorten the ends as much as you can. Now you have the 72 ohm impedance of the dipole well matched to the 75 ohms of the cable.