Wireless Joint

I currently have an Amazboost signal booster that only supports boosting 5 bands of cell phone signal. I'm thinking of getting a second booster from Bamwirz that's a bit stronger, and supports 8 bands.

My question is - would it be possible to put them on opposite sides of the house, connect the two boosters into a single line with a 2-way coaxial cable splitter, and then run that into a single booster in the house?

Nope! You will cause all sorts of issues.

You're thinking of a multiplexer, and they aren't cheap, and generally only are for use with a single system and multiple antennas. There are more complex ways yo go about it, but I'm guessing you don't have an industrial sized budget.

Is this for phone voice use, or data use? Both is fine, but these open air repeating boosters are really optimized for voice networks. The M2M versions are better suited for direct to data device use.

No, combining two different signal boosters using a coaxial splitter is not recommended. Signal boosters amplify signals independently, and combining them can cause interference, signal degradation, and oscillation issues. Instead, consider using a distributed antenna system (DAS) or a properly designed multi-booster setup to ensure optimal signal coverage without interference.

For the best performance, ensure proper placement of the outdoor and indoor antennas, minimize cable losses, and avoid signal overlap between multiple boosters.