Years ago, Bob Bruninga, WB4APR, talked about a "good" antenna for APRS SATCOM applications. It was a 19-inch vertical antenna that would function on both the 2m and 70cm bands, and had lobes that were up around the 30-degree mark. Looking for information on that antenna last night I found a page Bob had written expanding on the idea. This page provides designs for i-gate antennas on 2m and includes the 19-inch antenna as well as a new design, a 3/4-wave 2m antenna.
I'm seriously considering building one or both of these antennas this weekend to test out these antenna designs.