Power up that Mac AirPort card with the Quicky USB Antenna from QuickerTek. Of course the cheapest solution is just moving closer to the base unit, but remember you get what you pay for. So if your in a multi-story home, or large office space where walls greatly diminish your signal strength, get a Quicky power up.
As shown, a simple clamp locks her in place, a USB connection makes, well…the connection and also provides the Quicky USB Antenna with power. Supports both, or I should say most common, 802/11b and 802.11g networks. Since Mac folks are use to paying top dollar the Quicky USB Antenna is a measly $225USD.