Build a high gain antenna and you'll get a much better signal. Start with a "biquad" and attach it to a satellite dish if you're looking for more.
Unfortunately it's easier to just move. I like my lap tops portability. Would that be possible on most lap tops; do they have the small coax connector inside, or is the antenna built into a circuit board/module like in a cell phone?
I was going to try this on an old cable modem but found there is three antennas inside and they use phasing to steer them into a directional antenna in a very complex way where you couldn't just plug a bigger full wavelength antenna into it. Much like the do with cell towers to aim them at traffic as it moves through out the day like along the highway.