hd digital tv antenna up to 120+ miles range by ujm, indoor hdtv antenna with amplifier signal booster support 4k hd vhf uhf freeview ujm note : for the best reception , please check the following tips 1 . this digital hdtv antenna is intended for indoor use only 2 . placing the antenna higher or closer to the window may result in bettreception . you must re-scan whenever you move the antenna 3 . keep the antenna away from any sources of interference and keep theantenna away from those big power consumption devices such asconditioner elevator , hairdryer and microwave oven . et 4 . if you use a flat hdtv , please go through your tv manual to make sure your tv comes with built-in tuner for free view 5.make sure you are using a hd receiver , otherwise no hd channels can bepicked up . please read receiver manual 6 . you need to re-tune the antenna position and re-scan the digital channelsover and over again to ensure that you have received all available freeannels re-tuning takes only a few minutes and can be done with youremote control 7 . tv reception capacity depends on the distance among your hone ,transmitting tower and surrounding environments . 8 . for maintenance of the antenna , please use soft cloth with diluent milddetergent to clean its shell