Balloons! Balloons to you all!
Your all talking balloons! Thats the way to do a carrier based UAV radar platform.
"cheaper alternatives to manned airborne early warning aircraft include unmanned tethered balloons, as used by the US Customs Service (USCS) on the Mexican border to detect drug smugglers. "
(don't tell me a pilot can't navigate around the balloon)
And then we also have what looks to be the "relativley" cheap space radar:
Bung a few of those in space and you have 24/7 planet wide radar!
So, why bother with an E2C Hawkeye?