Query about URM37 V3.2 Beam Width.

Hi,
I have one query about URM37 V3.2 beam width. What is the distance at 30 degree angle and -10dB attenuation.
Please see below url.
http://www.dfrobot.com/wiki/images/8/80 ... ensor2.png
I have one query about URM37 V3.2 beam width. What is the distance at 30 degree angle and -10dB attenuation.
Please see below url.
http://www.dfrobot.com/wiki/images/8/80 ... ensor2.png