Yep, the 2 foot Firestick NGP. Don't yet know how well it works and may not know for a couple of months. I don't live where I can check it out with someone so will not know how it works for a couple of months probably. I think it should work well. If not, then I'll install a regular antenna that grounds to the bike. That should work also as it worked on my GL1800 for years. You cannot cut or coil the special NGP coax and they have you put the extra length into a bowtie shape with 1' or more width of the bowtie. I placed mine in the area under the passenger seat area and it fit fine. No holes drilled for this installation.
Not sure on the splitter from the Firestick. I don't use the FM on the bike very often (I also used the USB from the left saddlebag for my music), and it seems to work just as well laying horizontal at the back of the bike as it did mounted.
Have attached a couple of photos. In the picture of the mount with the antenna, I put extra tape around the mount and antenna connection just to ensure that it not get grounded to the bike. After installation I did a continuity check to ensure that I did not have the antenna grounded to the bike. A reminder that I purchased an additional OEM antenna mount that I drilled out for the CB antenna. I was going to make a bracket, but decided that this was simplier for me and would give me the exact mounting location and angle. The original mount for the FM antenna is still attached to the FM antenna and I simply moved it to the back of the bike under the top cover. That way I can put that antenna back as original if I desire.
CB antenna.jpg IMG_1126.jpg IMG_1125_sm.jpg