You won't have to unroot - the OTA update will simply write over the stock files that are on your phone. You're right, you will probably lose root with an OTA update, but you won't brick your phone. You won't need to unroot the phone before applying the 2.2 update.
If you install the leaked antenna update and then apply the OTA update you could brick your phone.
Once the OTA update to 2.2 is released someone will make a ROM within a day or two. I recommend staying with a rooted 2.1 and using a custom 2.2 ROM after the OTA is released. That way you have root and 2.2.
If you install the leaked antenna update and then apply the OTA update you could brick your phone.
Once the OTA update to 2.2 is released someone will make a ROM within a day or two. I recommend staying with a rooted 2.1 and using a custom 2.2 ROM after the OTA is released. That way you have root and 2.2.