How do I connect 2 satellite dishes over 1 cable to 2 decoders and 1 television please?

Hi

I have 2 satellite dishes pointing at 2 different satellites.
I have 1 cable between the location of the satellite dishes and the the location of the 2 decoders and 1 tv.
I want to connect 1 dish to 1 decoder and the TV
and the 2nd dish to the other decoder and the TV

What is the best way to connect this please?

I tried a splitter at both ends but it dosen't seem to do the job.
Thanks

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