The two transistor version A is merely a cascaded version of B for greater output. The one transistor version in B will easily penetrate two walls of an average household, while the cascaded version A, will penetrate two floors.
This will show you how to add a bi-directional, 2.4 GHz amplifier to your Proxim Symphony for under $100. Bi-directional means you can mount the amplifier at the antenna to help overcome any cable loss, and the amplifier will automatically switch between receive and transmit modes.
2.3 GHz Power audio amplifier circuit diagram and components.
Provides 1dB compression output power of 23W at 12V and a 11dB gain.
1 Watt 2.3 GHz RF Amplifier Using a MRF2001
Uses RF2126 at around 6.5 volts for slightly more power output.