"tony roberts" wrote in message news:nospam-BF5DB8.18453227122003@shawnews...
Can a 172 flying at 200 feet above water across Lake Superior get through
undetected by radar or AWACS? Are there holes in radar coverage?

You would have a good chance of sneaking through radar but if an AWAC
were monitoring the area then you don't have a chance. When I lived in
the middle east they could detect pickup trucks smuggling Scotch across
the border from Yemen.
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Agreed... Airborne radars can see to the ground. We've got them patrolling
the DC area and they can see stuff that ATC doesn't have a clue about.