For a long time i have not had any antenna for 70cm. Some weeks ago i visited Allan oz1GIN ( formerly OZ1LIT), and he had bougth some old, but unused Procom antennas:
There were not any clams supplied, but i found some in the junk box- they just needed sligthly bigger holes , but that was easy to drill the holes bigger.
It is ratede for 408-430 MHz operation, but a quick check on the network analyzer show it works fine on 434MHz ham band with SWR arround 1.4.
Thanks to Allan.