Stridesberg Multicouplers
I too have to say their customer service is 2nd to NONE! I sent them my MCA204M that I purchased in the 90's, I sent it to them a week ago because they always perfect their product and wanted to have it checked out since it has been used for almost 20 years. They sent me my coupler back completely updated and even paid for the return shipping, fast. Needless to say, I purchased another, their MCA208M. They informed me that if I wanted to turn my 8 into an 11 way splitter just add the MCA204M to one of the outputs of the 8 without any issues or overload, they also went as far as saying that you could put one on each of the outputs if you want to, just don't put another one onto the 2nd one. They indicated that the signal would not be hindered in any way with all the multiple splits. You can now enjoy many scanners, receivers etc with one antenna.
I own only 1 antenna, one that I believe is the most awesome preforming antenna, the Austin Ferret, it is expensive but works so so well, has outdone discones and many others. You can buy this antenna and get free shipping if you go to HRO as this is 8' tall and would be expensive to have shipped. Make sure you use the best coax with N connectors to bring the signal into the multicoupler, I use rg-8x for the short runs to each scanner from the output. Been using this method since the 90's and nothing to date works better.
My 2 cents.