I use:
- a rat-tail Diamond (5-something)? Good for local repeaters.
- Diamond RH-77CA, which provides excellent coverage.
I just bought a nameless "Super Antenna" from a hamfest, which is a 30+ inch telescoping whip that advertises +9db gain. It outperforms the RH-77CA for distant repeaters, but unfortunately it tends to knock birds down from the sky.