This antenna is insanely great. well made. It picks up police transmissions from Powers and S Carefree in Colorado Springs all the way across town to Monument Police FROM INSIDE MY BEDROOM! Thats 20+ miles of hilly city from inside a bedroom with antenna mag base sitting on a TV stand metal base and no clear line of sight. When I place my Remtronix tri-band rubber duck antenna back on I only get local stuff. Crazier still, my window has metal blinds. In every way youd think signal loss in every way. No, Im even getting signals from Fountain Co, Woodland Park Co, Black Forrest Co, Peyton Co. All areas around me that are 25 to 40 miles away. I pick up state patrol sometimes in Castle Rock Co which is 40 miles away with mountains in front of it. It picks up mountain forestry over 50 miles away at times. SDS100 works under a watt I believe but it makes HIGH efficient use of this antenna. In the photo I swapped mag bases with my Browning/Laird NMO type but its no different or better than the Hustler mag base. its the antenna that shines here. I use the hustler base for my UHF 2 way radios. BUY IT. you will love it on a SDS100 in your car with BNC connections.