Europilot mentioned his lack of radar contact in the Australian Outback.
I used to fly in southwestern Alaska and was under the impression no one was painting me on any radar screen--and then I learned the entire coast of Alaska is covered with military radar--they just don't share with ATC.
All that time I thought I was sneaking around the coastline all by myself but some punk in Anchorage was watching me in a dark warm room having a cup of coffee and a cigarette.