50 Miles HIDB ANT-1001 Portable Digital Antenna is an indoor outdoor HDTV antenna,working best for TV Tower 10-50miles away, without using a booster Pls check the available channels and signal strength in your area by visiting"dtv.gov/maps" or "tvfool" Small antenna for tvAcceptable for all portable applications: portable tv,smart tv,PCI tuner card,digital tuner,DAB radio,RV etc.Good for car TVs cabinet,metal rack,window frame,cable box; sit on table; attached to the back of TV/door/bookcase; even mount it on a metal plate in the attic or roof,it would work like a deep space satellite dish!DT502 Indoor TV Antennas for HDTV:Frequency:VHF-Hi 170-240 MHz,UHF 470-860MHzGain:18±2dBVertical Impedance:50?Volts: 5V/25mAOperation temperature: -30?85?TIPS: How well it works,depends on many factors,specifically the distance to the TV tower,signal strength,terrain,building construction,trees and elevation all affect TV receptionIf your antenna is not working:1) Make sure your TV has a builtin ATSC tuner;if NO, pls get a HDTV receiver/set-top box to work;2) Make sure there are available OTA channels in your area,and the signals are strong;3) Try to moving it around your house or Try scans from a couple different places and angles to see where you would get the best reception. Product Dimensions: 2.5 x 2 x 0.5 inches, 1.6 ounces