There are two ways to approach a problem with your 2WIRE residential gateway and the signal strength. There are probably going to be more cost effective options if you lean towards approach -2-
-1- Boost the signal strength at the transmitter.
If you want to boost the signal strength of the transmitter (2WIRE gateway), you will need additional hardware such as a range extender, which D-Link makes. This will boost the effective range of the 2WIRE wifi signals from the transmitter. One thing to remember, when you boost the signal so that you can pick up the wifi more efficiently inside of your house, you are also inadvertently boosting the effective range that the signal travels outside of your house. Your neighbor, for example, may now be better apt to eavesdrop onto your network and steal bandwidth (among other things) if they are so inclined. Wireless range extenders, signal boosters, wireless repeaters, whatever you wish to call them, will run you about $50-$100 depending on how the signal strength that they emit (a wireless-g rated device will be cheaper than an extreme-n rated device, you want more range, its going to cost you more).
My main issue with range extenders is that eavesdroppers will be more apt to stumbling on your 2WIRE because you are boosting the broadcast range of the wifi signal - further advertising your position to hackers.
-2- Boost the signal strength at the receiver.
If you boost the signal strength of the receiver (USB wifi adapter, PCMCIA wifi adapter, PCI wifi card), you will also need to purchase additional hardware, but there are more alternatives available that can be more cost effective. If you are using a PCI wifi card | PCMCIA wifi adapter | USB wifi adapter with a dongle for an antenna, it probably came with a 3.5-4" little antenna. WiFi signal will lost strength the more physical barriers that it has to travel through - walls, cabinets, refrigerators, whatever you have in your house.
You can increase the signal strength at the receiver by looking at purchasing a taller, stronger antenna and simply swapping it out with the factory antenna. Again D-Link makes omnidirectional high-power antennas which you can screw onto the dongle.
Or if you want to really go pro, you can purchase a cAntenna from EtherDesigns. The cAntenna is awesome, works with any wifi card that has a screw on dongle for an antenna. This thing is fun because it comes with a tripod and you can aim it more readily.http://www.etherdesigns.com/
You can purchase a high-power USB wifi adapter, preferably extreme-n or n1 signal rated will boost the signal strength at the receiver. D-Link and Belkin both make USB wifi adapters n1 signal strength rated which can work on both desktop and laptop computers. That will give you plenty of signal receiver strength to pick up your 2WIRE gateway - and probably any other residential gateways within a 2-5 house radius.
Again, I would lean toward boosting the signal strength at the receiver, shop around for what you think will best suit your needs. But by boosting the signal strength at the receiver rather than the transmitter, that will minimize the chance of eavesdropping on your 2WIRE gateway from external, unauthorized users.