This worked in the vicinity of Cologne, Germany with the antenna behind the window and facing roughly into west. The amplifier gets its power via the bias-T in the SDR but it has a very limited bandwith.
BTW, “EGC” means “enhanced group call”. As I remember, I could mainly receive a stream in clear text showing the identity data of the connected Inmarsat-satellites. The Windows-Software to receive and decode was available in the net.
But, of course, Othernet can not be received.
If you want to reuse the C.H.I.P. you can perhaps still find the software-loader in the web. They had a Linux-image, which worked quite well.
Hope that helps, Wolfgang