No doubt many have done this, me included.
Solo uses a diversity propagation protocol. As such it depends on a dual antenna configuration that works best if the antennas are balanced.
The Alfa develops 7db of gain vs the rubber duck (stick) making 2db of gain.
I replaced my 2db ducks with 6db whips. This both provides additional gain used together and better matches the Alpha in a combo set up.
What was you range with that setup?