I also have an RF logger interface that uses XBEE modules to transmit the logs and loop packets direct from the Vantage console to my PC/Pi or whatever you have weewx installed on, basically making a wireless logger interface.
Same footprint as the USB logger plug-in module and then has XBEE to USB at the PC end.
Works pretty fine, but again, definitely not an off the shelf solution (the boards can be purchased through Belfyboy I linked to above or via Seedstudio where he has them published).
You will need to solder some small components to the PCB's, program the logger chip and configure the XBEE modules to 'talk' serial @ 19200 ;-)