The RQ-170 that crashed in Iran probably had some sort of technology imported from the F-22. According to Aviation Week, the sensors are housed in an internal compartment with specially treated transparent panels.
[thumb]http://www.aviationweek.com/aw/generic/story.jsp?id=news/awst/2012/01/02/AW_01_02_2012_p28-409855.xml&headline=F-22%20Technology%20On%20UAV%20That%20Crashed%20In%20Iran&channel=defense[/thumb]
![111208-F-CJ433-001[1]](http://alert5.com/wp-content/uploads/2012/01/111208-F-CJ433-0011-500x332.jpg)