(Click on any of the photos for a larger version.)
Vacuum is generated by a pair of venturis. They are not easy to see in these shots. When an airplane with venturis flies by at pattern altitude, it can should as though it has a turbo. They are great for VFR airplanes as they don't break.
I didn't clean the belly prior to this shot. The whip antenna is an emergency one, I can plug a hand-held radio into it via a short length of coax. The connection for the antenna is at the bottom of the panel on the right side. The blade is a glideslope antenna. A previous owner flew this airplane IFR.
This one was from eight years ago, after a late-afternoon flight:
