Welcome to the forum.
First, yes you can split antenna signals. Just like cable you end up with half the signal after spitting 2 ways.
Now, if you have enough signal to begin with then cutting it in half is very little to loose.
About the only way to tell is try it and see if you loose any channels or any channels become marginal breaking up when they didn't without the splitter.
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We could get much more detailed here with a TVFool.com plot and we can if you like, but if you are happy with your current rabbit ears into one TV, just trying splitting it would yield the fastest real world answer.
One question. Have you tried the rabbit ears into the USB tuner directly? Does it receive the same channels as the TV? The reason I ask is my USB tuner is not as good on weak stations as my TV or my Converter Boxes. So you want to check both devices for which channels they receive before splitting and after.
Another factor to consider is how much total coax you will need. It the total to each device from the antenna is only 10 ft or so, then it should work.
I would say try it to see what happens, unless the TV and USB tuner are 20 feet or more apart, then just a second set of rabbit ears would be not only better buy cheaper probably.
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