basically, i can pick up a weak wifi signal. but i am wondering whether it'll be possible to add another wifi adaptor to my laptop so that it picks up two signal and combine it into one to boost the signal? tell me if i dont make any sense...

To boost signal you would an Antenna. It's just like a radio set. Two radios won't give you a signal boost. Thanks.

In a round about way it could work that way. Not sure it is worth the effort, there is more than meets the eye so to speak to do that. In a more simple test, you might consider borrowing a card. Using a different cards type or brand might show enough of a gain to overcome the issue. As above there used to be cards that one could add in an antenna via a jack/plug and there are books out there that show how to modify some types of cards for either an external antenna or improve the existing one. I read it wrong and answer it wrong too. So get off my case you goober.