ChannelPlus Linear LPF-600 Linear Low-Pass Filter 0 to 600 MHz band pass frequency Passes off-air TV channels 2 to 35 & Passes CATV channels 2 to 86 Filter removes noise for better picture Simple installation with no external power supply required Allows insertion of TV channels 40 to 69 & CATV channels 91 to 125 Low-pass filter removes all cable television channels above pass band Insert locally generated ChannelPlus modulated channels Filter also removes noise for better picture Simple installation requires no external power supply Device measures 3 x 1 inches (LxW)