I am looking for market statistics for WiFi test equipment.  I need to know:

1)  market size (in terms of revenues) for WiFi testing gear
2)  who buys the equipment typically
3)  what do they use the equipment for
4)  the vendors that sell WiFi testing equipment

I am looking for full layer 1 (physical layer) information, as well as
logical (layer 2 and above) information.

Please make all your answers with references if you have them.

Dear amtpayer, 

I am sorry, but I couldn't find all of the information you were
looking for in a public document. I did find, however, the following:
Wi-Fi Chipsets, Equipment and End-User Devices
<http://www.researchandmarkets.com/reportinfo.asp?cat_id=&report_id=30110>
- a market research on the subject (a copy costs AUS$ 3,568.00).

Your question is about to expire, and if you're interested in an
answer, you might want to consider re-posting it, dividing the 4
different questions into several different postings.