We hear this question every week on the net. This was an easy one for John KK4ITX, who just completed building a Moxon antenna.
So what is a Moxon, and how much moxie do you need to put one together? For starters, the Moxon is basically a two element antenna, with one driven and one reflector section. The unique feature is that the ends of both sections are bent in toward each other forming a rectangle with a gap where two of the sides of a rectangle would normally join. A diagram should help. And yes, there is a computer program to help you with the dimensions, which depend on the band you are designing for. More on that later.
This is what John’s Moxon looks like.
The Moxon can be mounted either vertically or horizontally.