Trying to add a second tv from one set top box. Same picture as main tv, just...

...extending it outdoors.Pls help!? Ok, so here is what I have...
- Fios set top box connected to my tv via hdmi.
- Have been using rca (audio only) outputs to hear tv audio outdoors.
- Now I want to use the rca video and duplicate the same picture outdoors. I dont want different signals or channels, just to extend the same picture outdoors without moving the same box outdoors.
- Already have a coax cable between inside and outside available.
- Tried using an RF modulator for the RCA output signal. My main tv still works perfectly, but the second tv is showing a sporadic and snowy picture.
- How can I get the RCA output signals from a FIOS (digital) box passed through a coax and display normally the same picture as my main tv?
 
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