you are the one who is not familiar with how active antenna works.
some active antenna can be powered via the coaxial cable and do not need other (usb) power adaptor.
go and google yourself.
I recorded a video showing the effect of the Antenna Power option when it's turned 'on' and 'off'.
I started off with the Antenna Power being turned on and after that with it being turned off.
The signal intensity was 100% when the option was turned on, but it dropped to 70~74% when the option was turned off. Signal Quality remained 100% throughout.
This does mean the box supplies power to the antenna, to make it active.
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gregory_choo, you are the one that is not familiar. If not, why you did not advise about using USB Booster to enhance the picture quality? You knew this USB Booster can make your TV Antenna get More Channels & Enhance TV Signal, yet you kept silent...
Switching on the Power Antenna option in the set-top box, this part is no doubt about it.
I knew Active Antenna powered via the coaxial cable works.
But what I mean is You need 2 Amplifiers, with added USB Power Booster to obtain the Maximum Distance, Signal Quality & Best Picture.
No point to argue who is right or wrong. You Believe powered via the coaxial cable is enough... That is your Standard.
My Standard is 2 Amplifiers, with the added USB Power Booster source!
Please watch Part 2 of youtube on "How to Install DTV equipment".
There, you can see the demo using "USB Power Booster"
Link:
https://www.youtube.com/watch?time_continue=1&v=MvhxFpZjtB8
Active antenna
Includes two amplifiers, one for the downlink an one for the uplink.
The purpose of the downlink amplifier is to maintain the best possible signal quality at reception. The purpose of the uplink amplifier is to deliver the needed RF power into the antenna.
Without these amplifiers, the loss of the coaxial cable will have a severe impact on performance.