The difference between a yagi and a parabolic dish?

A yagi is a series of elements one reflector, one driver (this is the only element that has the feed line hooked to it), and one or more directors. The more elements there are the higher the gain and the tighter the beam.

A parabolic dish is just that a concave saucer like collector and a feed horn that is hooked to the feed line.

The diffence between 19Db and 24Db is 5Db. You have to make the desicion to pay the extra money or not. What are you trying to accomplish?

Later,
D