Venus Gps Arduino

I recently got a venus gps with sma connector and want to connect it to my arduino pro (8mhz, 3.3v ATmega168), but I have had no luck whatsoever, I do have an antenna plugged in and I cant seem to communicate with it in any way, if any one has any experience with this, I just need to find a way for my arduino to interface with the gps, and nothing has worked so far so any suggestions are welcome

thanks in advance-

airplanesrule