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Test the incoming signal by connecting a tv directly to the antenna downlead (booster disconnected). The general rule is there should be enough good clean signal to operate at least one tv properly otherwise there is little point using a booster.
If the tv operates correctly the booster should provide enough signal to operate all 3 tv sets, assuming there is nothing wrong with the wiring; coaxial cable, connections and so forth.
If the test tv doesn't operate you will need to revisit the antenna, the positioning and aim and the downlead. Sun, rain, wind and frost can ruin an aerial downlead in a few years.
TV signals are funny things. A signal that is perceived as being weak might not be at all because unless great care (and some luck) and some good materials are used longish cable runs can gather so much interference the tv set behaves as if the signal is weak.
A splitter will halve the signal.
Ideally a booster should be positioned close to the aerial so it is amplifying a cleaner signal and not amplifying interference. A masthead signal booster is the best option for a single or double downlead.
For a rooftop aerial and multiple downleads, first the aerial must be a high gain type in the frequency band used in your area. The shortest downlead possible would then feed into a signal booster (in the loft) with multiple outlets so each room or tv set has an exclusive downlead that hasn't been interfered with or split.
Each downlead should be low-loss double-wrapped coaxial cable with the best quality plugs you can find.
You might find it easier to obtain an exclusive aerial for your bedroom tv.
You could try replacing the aerial cable to your room with low-loss cable and get rid of the splitter and booster and replace with a quality booster with two outlets...
Just connect the external web-cam.
Then, open the software that uses a web-cam, and configure it to select the external web-cam, rather than "defaulting" to the internal web-cam.
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