There is existing RG6 w/F connectors ran to both locations. I can connect both rooms via RG6, my question is this: can I convert RG6 w/F connector to RJ45?

I'm trying to figure out how much each set of connectors in a RG6 run will attenuate the signal. Maybe my Google is failing me, but I can only find signal attenuation by length. I'm moving things ...