Hey Red...I'm no expert either but have caught tog off rock piles,jetties and sod banks...From what i have experienced about sod banks is they hold off the banks on the ones where it drops right off...So more than anything you need to have a sod you can fish off of that gets deep...I'd stick my neck out to say 15' or greater..which seems to be the deeper the better for me...And you don't have to drop right off the edge..You can cast out a little just enough to get to where it drops down for you..Than lock it up and ram them home...Hope it helps...Pazman