Here is a table of the average gain/loss for an active splitter:
Type | Gain at 400MHz | Gain at 1GHz |
2 Way | +2db gain | +4db gain |
4 Way | 0db (no gain and no loss) | 0db (no gain and no loss) |
8 Way | -5db loss | -5db loss |
These are average numbers that I found. Check the documentation for your splitters for numbers
Active splitters can be a great help if you are having signal problems and don't want to install an amplifier. Remember, active splitters need power, so you'd have to locate it near an electrical outlet.
Active splitters cost around the same as an amplifer.