The Hy-tower uses a proprietary base and I dont think a cast base is the way to go. Just follow the instructions in the manual and you will have no problem and let the pro's come with a cement truck and pour the 1cu yard of concrete needed. It is cheep and easy. cheers Ken K1ZYW --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html ---