Nigel, the main reason that perfboard exists is to experiment with, not to make a final product. I always like to make an experiment board first, whether its on breadboard or perfboard before I go and make a PCB that does not work (I hate troubleshooting PCB circuits). Perfboard circuits are not meant to be pretty. When I make a PCB, I'll take a picture and you'll have to eat your words :lol:
As for my coils, mine are quite a bit smaller, never saw the directions on how to make them. The strange thing is, my radio is not overloading. It is probably about 50 feet away, and the signal has to go through the whole house to reach the radio, yet the signal is clear as a bell and very strong too. I would think if I made coils that big, the carrier frequency would be way below the FM band and all I would get is a load of harmonics up in the FM band. So what exactly are the specifications for making those coils?