user10619: So I work a lot filming events making aftermovies. Often my job requires me to get a master out from the mixer or the sound tech and I am at the will of them so to speak with regards to my audio. Rode Video Mics, Shotguns close to the stage .etc. all provide too much echo/reverb and overall bad audio. When I get master out I rarely have a problem, and usually get pretty good audio. 
However, I have noticed that 99% of the in-house audio is transmitted wirelessly via Sennheiser G3's. Usually the receiver is this Sennheiser rack mount device. All in all something like this. My question is, if I get a G3 receiver couldn't I just get the frequency of the transmitter and 'tap' into the speakers transmitters, and secondly, would this cause an issue for the soundbooth guys?

user5814: This is commonly done. 
I suppose with modern digital systems it might be more complicated, but with standard analog systems it should work fine. You'll just need the frequency from the FOH team.

10619: <p>So I work a lot filming events making aftermovies. Often my job requires me to get a master out from the mixer or the sound tech and I am at the will of them so to speak with regards to my audio. Rode Video Mics, Shotguns close to the stage .etc. all provide too much echo/reverb and overall bad audio. When I get master out I rarely have a problem, and usually get pretty good audio. </p>

<p>However, I have noticed that 99% of the in-house audio is transmitted wirelessly via Sennheiser G3's. Usually the receiver is this Sennheiser rack mount device. All in all something like <a href="http://www.bhphotovideo.com/c/product/843445-REG/Sennheiser_EW122_135G3_G_EW122_G3_DUAL_LAVALIER_HH.html" rel="nofollow">this</a>. My question is, if I get a <a href="http://www.bhphotovideo.com/c/product/618789-REG/Sennheiser_EK_100_G3_A_EK_100_G3_Wireless.html" rel="nofollow">G3 receiver</a> couldn't I just get the frequency of the transmitter and 'tap' into the speakers transmitters, and secondly, would this cause an issue for the soundbooth guys?</p>
 5814: <p>This is commonly done. </p>

<p>I suppose with modern digital systems it might be more complicated, but with standard analog systems it should work fine. You'll just need the frequency from the FOH team.</p>
