Hi welcome from Australia, i believe when u put the rd antenna behind plastic, some work better than others thats due to what the plastic is made from some have metals in the mixture when being made beter to have a clear view, or find out what type of plastic, also a we have an international sec http://radarandlaserforum.com/forumd...-International , and in the Australian sec there we have an interest in the stealth SS3 ,system, and would also like any info on the Stinger, models and performance