There are passive airband monitors that are specifically designed for this. I bought a kit online for < $90 (still have to put it together though haha).
http://www.amazon.com/Passive-Monitor-Soldering-Assembly-Required/dp/B000E8ONGU/ref=sr_1_sc_1?ie=UTF8&qid=1438314633&sr=8-1-spell&keywords=passive+aireband