It's airspace-specific, not aircraft--so it depends on where you want to fly that C-152.... With the broadest of brushes (not intended to be all-inclusive nor guaranteed 100% correct!): Class A, B, C; above 10,000' MSL; and within 30 miles of a Class-B airport--you'll need to comply. If all your flying is in rural areas away from larger airports, you don't.