Check the listing for details. ANTENNA AMPLIFIER 50dB ULTRA HIGH GAIN II HDTV UHF VHF SIGNAL BOOSTER. Condition: Open box. Listed at 129.99 USD. this is a 50dB total gain (TWO) Amplifier Setup! items are bought in bulk and have been repackaged. includes 1-20dB High Gain Amplifier, 1-30dB High Gain Amplifier, 1- Power Supply with Inserter and 2-short rg6 connection cables! these are Professional Quality Amplifiers and work Great for HDTV Over The Air Antenna Signals. these are very high grade amplifiers! i have used these amplifiers for installing HDTV antenna systems for years with very little maintenance. they work great for long runs of cable, 50ft or more where the signal is dropping off before it reaches your receiver! the 20dB amplifier should be installed at or near the antenna transformer as a Preamplifier and the 30dB High Gain Amplifier can be installed most anywhere downstream along the cable line! this amplifier setup with it's 50dB gain has an amplification power factor of (100,000:1)! however: it is necessary to have a good out door or attic type antenna system to work properly! please remember you can NOT amplify a TV signal your antenna is NOT receiving!! you may also need a second antenna depending on your location!! IMPORTANT NOTES: this amplifier setup is not compatible with other amplified antennas or amplifiers; they will not work! this is a very high powered setup and can over power your system in some cases! if you do not think you need this much power then i have other amplifier setups so please look at my other listings or contact me! also note: open box items may have small cosmetic imperfections! pictures of my test setup show the basic hookup/wiring but are for illustration only! products can and do vary!! if you have any questions, please just message me and i will get back with you ASAP!! thanks for shopping with us and have a great day! SUPPLIES ARE LIMITED SO ORDER YOURS TODAY! Vast Improvement over the 30db Gain RCA Pre Amp... “Vast improvement” ...... Shipped Fast Easy install ...for me at Least.. Highly Recommended Upgrade..!!! Thx Dude..!! Worth every penny....!!50dB Ultra High Gain Pro HD TV Antenna Pre Amplifier Signal Booster Vhf / Uhf