"Hobo" wrote in message
...

Is it because a radar wouldn't fit into the funny shape of the aircraft
or because LPI radar of that era wasn't good enough?

The LPI radar on the B-2 is a flat planar array, which is easier to
'stealth' - you can just set it into a flat RAM panel, because it's
electronically steered. When the F-117 was being developed, the only type of
radar available was the conventional mechanically scanned antenna.

Matt