[TowerTalk] about four square vertical array

[wghsend at sohu.com]

i want to build a four square vertiacl array.my application is covered 3-30MHZ,do you think it is possible?
and i want to know more detail about arraysoultion's four square controller.i don't understand how to calculate the elements of the lewallen network.where the formulas for Xs and Xp come from? i need some paper about it.please reply to my mailbox wghsend at sohu.com. thanks!

Johns.