|More or less. The more splitters used, the more degradation you'll get. If only one appliance is in use, you'll still get some loss, but it will be negligible (less than 0.5% per splitter). This is due to the extra cable runs, and the inherent signal leakage.|
However, boosters are fairly cheap, and give you the convenience of being able to operate all appliances at the same time.
Please let us know if you found someone's advice to be helpful.