Check with the manufacturer. I put my guyed tower in a cubic yard, but I'll bet the manufacturer would specify a larger whole, particularly for a self-supporting model. ----- Original Message ----- From: "Brett Winches" <[log in to unmask]> To: <[log in to unmask]> Sent: Monday, August 06, 2007 4:14 PM Subject: Tower instillation question For a 50 foot guyed and non guyed crank up tower, what is the recommended concrete base dimensions (minimum or maximum)? =20 ###Thank you! Brett Winchester=20 [log in to unmask] ICBVI -- Reading Services P O BOX 83720 BOISE IDAHO 83720-0012=20 208-334-3220-104 208-639-8386 DID 208-334-2963 fax ###