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Which is precisely what has been written above. I just used fewer words...

Or, it may not. I can't find any mention about what technology is used for the duplexer. I couldn't even find a picture or a video of the repeater with the case open. Also, the specifications do not mention Rx/Tx isolation. But, at a $400 price point, whatever duplexer they are using, it can't cost much -- though, it is probably the most expensive thing in the box.

The rules of both GMRS and Amateur Radio prohibit communicating outside their respective frequencies except in emergencies. SImply put, an Amateur Station can not listen to a GMRS station, and the GMRS station listen to an Amateur Station for the exchange of messages (traffic) by each transmitting on their respective frequencies; aka cross service communications. It is perfectly legal for a GMRS station to exhange traffic with another GMRS station, and then if they are also licensed in the Amateur Radio Service to forward that message across Amateur frequencies; also a message from a GMRS operator can be verbally or written passed to an Amateur operator for them to retransmit the message on Amateur frequencies. All assuming the message content does not violate the rules of their respective services.

Well, I can help answer some of your questions.... The 452 MHz band is fully used by broadcasting, public safety, and general business radio service. (as is the entire 450-470 MHz band, except for our very generous slice) The 472 MHz band is right in the middle of over-the-air television channel 14, which uses up everything between 470-476 MHz. 476-482 is channel 15, and it goes up every 6 MHz from there until you hit cellular telephone, which is currently 614-890 MHz, and expanding. There is no such thing as an "underutilized slice of spectrum" in the UHF band, or anywhere else for that matter. There is no problem with our current 5 MHz split. It has been working just fine for decades. There is already a filtering solution for this. It is known as cavity filtering. A set of UHF cavities made to handle 50 watts is about the same size as that little toy shoe-box repeater you linked to in your post, and the tuning on most are loose enough to be used on any 2 adjacent channels. You seem to want an 8 channel repeater - I still don't know why you need this. This thing you linked to is only 10 Watts anyway. Just use Simplex. Interesting note: That Retivis repeater seems to be built into a re-purposed cable TV line amp box. Lastly, please refrain from using non-appropriate language on this site.

There is a few repeater stations around have always been into radio was a cb radio guy for many years but been off for many years now also and was looking to find something a little interesting to get back into ...So starting back into it again i figure i would go gmrs for a bit till i get time to study for ham also .....So with that note looking forward to talk listen and learn more ...There is some action around me not as much as i would think but been traveling with the handheld in the commercial vech during the day and pick up lots on the way