I am looking to get a wispy, but firstly I just want to check which one will do the job. I want to be able to visually show the difference between 40MHz 802.11n transmissions and 20MHz 802.11g transmissions. Secondly I want to be able to visually see the energy spread difference between 802.11b and 802.11g. Finally I also want to see how much frequency bleed there is, into adjacent channels at varying distances. I would expect that if you put Wi-Spy right next to a transmitting device it would show its channel usage as being wider than the standard 20MHz.

Thanks for your time