I also would look at tower construction or design as the problem.
Gale-force winds are expected across the state, reaching speeds of 50 to 75 kilometres per hour with gusts of 90kph to 120kph.
Damaging winds gusts of 90kph to 115kph and winds averaging 50kph to 65kph have been recorded at multiple locations including Ceduna, Coles Point, Port Lincoln, Minlaton, Kadina, Woomera and Mount Crawford.
Past History below of recorded wind speeds!!!!!!!!
The SA record is 167 km/h at Woomera on 14 November 1979. While I haven't checked I presume this was a thunderstorm.
Finding wind gusts is a bit messy because a lot of the AWSs didn't feed daily maximum wind gusts into the database until quite recently, and the hourly/half-hourly gusts are full of dodgy observations. The following SA sites have recorded gusts of 120 km/h or more (this may reflect data availability rather than winds):
Woomera (max 167)
Leigh Creek (149)
Oodnadatta (141)
Marree (128)
Ceduna (158)
Neptune Island (122)
Cleve (124)
Coles Point (152)
Port Augusta (130)
Cape Willoughby (137)
Adelaide (WT) (148)
Parafield (141)
Penfield (145)
Adelaide AP (135)
Edinburgh (152)
Mount Gambier (143)
To pervious comment about cyclones below is a track map of cyclones, some travel vast difference over land and a few have formed overland.
https://www.dropbox.com/s/3hjwfvcpl3...lones.jpg?dl=0