Unless you are building an established design (e.g. bow tie array etc) I'd skip it until you gain a good understanding of impedance matching, transmission lines and baluns. There are lots of good TV antenna 'recipes' that have been worked out that actually work quite well.
Pls, could you describe the construction details a bit more,
1. Is the entire inside of the horn/only the triangles lined with aluminium foil?
2. must the triangle be made with wires?
3. 450 ohm TV cable?
4. must A-A be as close to each other as possible, so as to get 60 degrees?
5. Broadband?, Does that mean i don't need to design the ant to the desired frequency of 582MHz? making the D= 103.2m ( 40'')?
Thanks!
1. Essentially you make two triangles, they come close together at one vertex and then they flare out at about 60 degrees.
2. no, I used Al foil, any metal could be used. Mesh would be OK at lower frequencies (or fine mesh for higher freq). If you use a mesh, I'd suggest using solid plate/foil for say the first 20cm or so.
3. the feed impedance is about 400 ohms, close enough to 300 ohm feeder, or use a 300ohm to 75 ohm balun. This is important, don't just connect it to 75 ohm coax.
4. say 1cm apart, not super critical. I used a standard balun with about 150mm of bare stranded copper wire on each terminal, I simply laid these on the Al foil and laid a strip of sticky tape on top of each one.
5. yes, this is one of the major benefits, it is very broadband so dimensions are not critical. The bigger the better (more gain).