I managed to work WD9EWK from my car using only my Kenwood HT and the omnidirectional whip mounted on the roof of my SUV. I didn’t have my voice recorder with me, so I didn’t get a recording though. Obviously using an omni antenna picks up a lot of signals and intermodulation distortion: there were all sorts of carriers and pager noise from all directions. Still, it was doable. QRP into an omni!