I have (and have read) the Cisco "Fundamentals" book, but I prefer the Planet9 "CWNA"(Certified Wireless Network Admin) book published through Osborne.
IMO, the concepts are explained better, the diagrams are better, and overall, the book addresses the topic from a more practical point-of-view.
For the tests I took, there was more appropriate information in the CWNA book than there was in the Fundamentals book.
Good Luck!
Scott
ps: If you're going to sell wireless, under no circumstances should you sell a system without also selling (or performing) a site survey. If the customer won't pay for a site survey, either rebate the cost back once the system is sold or walk away.
The grief and expense of correcting a system installed blindly is easily more than the margin you get from the sale. I think you'll find that the customer satisfaction post-sale will also be much higher.
- Scott
