THREE interior TV locations?
Let me ask you a question.. Is there a wall plate with a Switch, A light, a 12 volt outlet and a TV antenna fitting, it will likely be near your Main TV and may well be connected to it. This is your starting point
If so unscrew it from the wall and inspect the rear. How many coax cables 1,2,3 (likely 2) if two we are in business.. leave it hanging for a bit.
Is your antenna a WINEGARD Sensar II or III (Batwing?) If so we are now golden
Get to an RV supply and pick up two things
1: Wingman (around 30-40 bucks)
2: Sensar PRO (bit more expensivem, like 100 bucks give or take)
Now, on the roof, mount the wingman, Only tool you MIGHT need is pliers
Indoors First On the wall plate, Identify the ANT wire and the TV/2/3 wire (often the ant is on the left loopking at the rear, with the 12 volt outlet at the top) and label them. If there were 3 wires it is a bit more complex and I'll address in a bit.
Disconnect 12 volt wires and protect against shorts (tape Cellophane type is good here) Now insert the sensar pro in the hole and see if it fits, if not you will need the spacer included with it.
Hook ANT wire to ANT
Hook TV 2/3 to TV 2
Notch corner of box and bring TV 1 out
Run a nice new cable (I am partial to RG-6 but 59 will do) from the wire marked CABLE to any handy outdoor connection point.. How to route is up to you.
Connect 12 volt wires (remove tape) and install box.
Tap the MODE button and it should light up, you may need to double tap.
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If there are 3 wires hooked to the back of the wall plate
Normally they are ant/cable/TV-2 but well... You said there is no cable so they might be Ant/TV/2?TV-3 You will need to test to insure.. one way to test is easy.
Turn on the tv.. Tune to say channel 3 (Analog) touch the wire, watch the screen (touch the center wire) when you hit the wire that feeds that TV you will see a change in the static.
If the wires are TV-2 and TV-3 (TV-1 is the front jack) then you will need a short jumper coax and a splitter
TV-2 Jack to splitter splitter to TV-2 and TV-3 coax lines
If you have only TV-2 cable, then the splitter already exists.
I have TV-2,3,4,5 (only have 3 Tv's and 2 DVR's but I have jacks for several additional (3 additional) tv's if I put 'em in) Originally the plan was to move one TV around to where it was needed depending on configuration, Did not work out that way.