Chris if you are not listening to the same frequency on both you dont want a splitter you need a diplexer. This is effectively two filter with a common input, one is lowpass for LF one is HP for MF (
Hello Chris, if you use the common broadband design you surely can listen on LW and MW at the same time with a power splitter,e.g.like here https://ww2.minicircuits.com/app/AN10-001.pdf A diplexer is