I don't want to get into the whole radiation debate because I don't know much about it, but you should realize that these antennas have an output power of 2000mW (2 watts) which really very high, so if you use it as your main internet and it's pretty close to you, then you might want to read up on the risks. I think the FCC legal limit is 1 watt for 2.4GHz.
If you're using this one in a while I wouldn't be so concerned, but if it's your regular internet connection it's something you should at least be aware of.
Perhaps someone with more knowledge can chime in.