Steven P. McNicoll wrote:

But if you don't have a radio it's probably because you don't have an
electrical system. If your airplane has never had an engine-driven
electrical system it doesn't need a transponder or encoder to operate in the
Mode C veil.

A plane like that would probably bounce off the Sears tower.

George Patterson
"Naked" means you ain't got no clothes on; "nekkid" means you ain't got
no clothes on - and are up to somethin'.