1. What are you using as a combiner?
2. Do you have a single continuous length of coax between the amplifier and it's power inserter?
3. Do you have a multimeter?
4. Did you test anything individually before integrating all the components or did you do an "install and hope"? Did you build the system one step at a time and test at each step?
The cable length between each antenna in this configuration is irrelevant.
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