If you give the team at InnovAntennas a call and explain the application, they’ll tweak the antenna design to match the GRAVES frequency for no extra cost (they didn’t charge me extra). There are some additional notes here relating to a supplier of a pre-made cable too.
If you take a look at the RMOB webpage, you’ll see that everyone who was monitoring the GRAVES frequency had dropout on the night of the Geminids maximum.