This machine is called DVB-T COFDM mdoulator transmitter generator ( DVB-T COFDM transmitter box)
This box take HDMI / CVBS as video source and modulate it become DVB-T UHF signal.
If your HDMI /CVBS video source connect into this DVB-T transmitter, your DVB-T receiver will receive this signal within 50~ 100m
It take HDMI / CVBS (composite) as video source.
I use TOSHIBA win 7 NB as HDMI output and this HDMI output connect into DVB-T transmitter as video source.
At this time, HDMI will be live broadcast by DVB-T UHF frequency.
The set-top box from TV of antenna will receive the DVB-T " FBBON channel" and then demodulate become HDMI signal.
TV will display the HDMI signal from DVB-T RX box.
The default channel of FEBON DVB-T transmitter is 521 Mhz UHF.
It is very easy to setup.
You just only give this machine HDMI or CVBS signal.
it will auto modulate into DVB-T 521MHZ.
Your DVB-T RX box just to scan 521 mhz.
You will easily to see the video by wireless DVB-T transmission.
DVB-T transmitter is like FM audio.
Many people who own the DVB-T RX will receive the signal.
NOT only " one by one" but also " one by 100"
I also use MAC DVB-T USB dongle to receive at the same time.
So, you can see the video on TV and you also see the video on the mac air.
Not only HDMI but also CVBS can be as video source.
FEBON DVB-T transmitter will auto detect HDMI or CVBS.
If you connect HDMI video source, it will modulate it become H.264 video stream.
If you conncect CVBS video source, it will modulate it become MPEG-2 video stream.