How to connect digitalbox-avkodare

Hello,
Recently I have bought an new 55" 4k TV. I would like to connect my new TV to avkodare-digitalbox to receive chanels from my country. Here is the problem because all I have to do is putting HDMI cabel between TV and decoder and also putting an F-cabel (antenn kabel) between decoder and satellite antenn. I did try with diffrent cabels and with diffrent converters because I have few of them and I always have 0% quality and strange power or whatever they are named.

Can somebody explain me that?

Thanks in advance.

P.S I can receive swedish chanels thru the antenn kabel (hane/hona)