Do we need to purchase WiFi for the VEX controller for 2008 Elevation?
Short answer, no.
This FAQ will answer your questions:
For 11 years? Anyway, you need 2 vexnet keys to wirelessly control a bot with the cortex system. With v5, you can use bluetooth between the controller and the robot, but the vexnet radio is MUCH better. Also know that you cannot compete with bluetooth, as it doesn’t work with the field control system present at competitions.
Also, please don’t revive old threads. It tends to clutter up the forum.