Range is a key consideration when selecting your Wi-Fi solution. Although it is often desirable to have the gear that operates with the longest range, don't get stuck in the mindset that the longest range is the best.
A longer range solution (such as 802.11g) reduces costs in that you do not need to buy extra APs to reach distant clients; however, a shorter range technology (such as 802.11a) makes it easier to segment users and reduces interference between neighboring APs.
A discussion of range involves an approximation at best. Don't take Table A-3 into your organization and expect the ranges to be exactly as they are described in the table. Range is greatly affected by your environment, including the materials used in your building and any sources of interference. Table A-3 shows the types of ranges you can expect at differing speeds from the 802.11 protocols.