SMA CIRCLING OVER HIS PROPERTY HAS NMAC WITH SECOND SMA ACFT.

Narrative

I WAS CIRCLING OVER MY PROPERTY; LOOKING AT VEHICLE TRACKS ON THE GND. ON MY THIRD CIRCUIT; I LOOKED UP AND SAW A SINGLE ENG; LOW WING PLANE PASS BELOW AND IN FRONT OF ME. I WAS TURNING COUNTER CLOCKWISE; PASSING THROUGH APPROX 030 DEGS MAGNETIC. THE OTHER PLANE APPEARED TO BE HEADING ABOUT 240 DEGS. HE MAY NOT HAVE SEEN ME; AS HE FLEW STRAIGHT AND LEVEL. HE WAS ALREADY PAST ME BEFORE I COULD CHANGE COURSE. I FOCUSED TOO MUCH ON THE GND AND NEGLECTED TO SCAN ENOUGH FOR OTHER ACFT. THE OTHER PLANE APCHED FROM MY WING-UP SIDE; AND I TEND TO LOOK IN THE DIRECTION I'M TURNING. THE OTHER PLANE WAS HEADING TOWARD THE SUN BUT COULD HAVE SPOTTED ME; AS I WAS ABLE TO TRACK HIS DEP WITHOUT DIFFICULTY. MY PROFILE WOULD HAVE BEEN LARGER WHILE TURNING BROADSIDE. I SHOULD HAVE BEEN MORE VIGILANT CONSIDERING I WAS IN AN AIRWAY. I WAS NOT IN CONTACT WITH ATC; AND WAS NOT MONITORING THEIR FREQ AS I NORMALLY DO. EITHER STEP COULD HAVE GIVEN ME A WARNING OF TFC. I DO NOT KNOW IF THE OTHER PLANE WAS IN CONTACT WITH ATC. MY BEACON LIGHT WAS ON; BUT NOT THE LNDG OR TAXI LIGHT. THE PLANE I WAS IN IS NOT EQUIPPED WITH STROBES. I DID NOT NOTICE ANY LIGHTS ON THE OTHER PLANE. IF I HAD HAD STROBES; IT MIGHT HAVE HELPED THE OTHER PLT TO SEE AND AVOID ME.