It depends, on things like the band in use and the length of ground wires. Something might be causing RF to appear back at the breakers and causing premature trips. However, some of the Yaecomwood rigs will fold back power just over 1.5 :1 SWR. Was surprised to find this on the 765 Pro II I was using at the seacoast last week. 73, Stuart K5KVH