Any ideas on how good these antennas might be, and are they just for reception or also for transmitting as well?
To try a “pcb” antenna you may consider — get one with the sma fitting installed, in theory 90 degree is
better it seems a little awkward.
https://www.ebay.com/str/calcmechengineering
I don’t know the power rating on the traces on the pcb, but it should work.