I have the same car and radio and find the am reception is excellent. For example I get good reception of ABC 726 and 891 well past Salt Creek on trips to Robe. My Waeco CF50 fridge however causes annoying interference reducing the clear reception range to about 80km. - only when it cycles on at the most interesting moment of the program.
So I suspect there is a fault in your system.
cheers
Peter
D4 TDV6 2014, Tow Pro, Traxide, GME, Clearview.
D3 SE 2008 2.7, Traxide, Prodigy P2, Light Force, GME, Sold to my son!
D2 TD5, sold but missed.
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