ADU 0243: What are the contraptions around the antennas on the radio transmitters? Do they serve a function such as enhancing the range?

Thanks to Trace from North Carolina for today's question, and for the first question of 2016! That's hard to believe. He's asking what are the contraptions around the antennas on the radio transmitters? Do they serve a function such as enhancing the range? Thanks for submitting another question to us, Trace! Stay tuned for the answers, everyone, and fly safe! Get your questions answered: http://askdroneu.com/. Tell us what you think of the our show. We listen and tweak often. So please leave a review on iTunes: https://itunes.apple.com/us/podcast/ask-drone-u/id967352832 Follow us: Site - http://thedroneu.com/ Facebook - https://www.facebook.com/droneu Instagram - https://instagram.com/thedroneu/ Twitter - https://twitter.com/thedroneu YouTube - https://www.youtube.com/channel/UCgJ5K7wWoFlnYC3e8eIxYrA