What are those dome things you see in sporting events?

[nodoubts2k]

Like NFL, the guys are holding those oval shaped things. Also i just saw one on the fox game.. what are they?

 

[BlamoHammer]

Methinks they are microphones used to get you those wonderful sounds from the line of scrimmage.

 

[Jhill]

I think they are to pick up sound.

 

[ThePresence]

Directional Microphones.