1) Yes. It is that simple. just make sure you set the transmit frequency 5 MHz above the receive frequency. Also, initially you may not want to set tone on receive. That way you can hear everything on channel. 2) A repeater sounds like a good solution to your needs. Based on the advertised specifications, the Retevis might be a good candidate. However, I have no personal experience with the radio. As for the antenna, I would want to keep it as simple as possible. If you really are all line of sight to the repeater you will likely get by with a simple quarter wave. Also if the repeater is substantially higher in elevation then the stations that are accessing it, a gain antenna like the J pole might not be a good idea, since they reduce the amount of energy radiated downwards. In this case, the quarter wave would be ideal. Finally, the SamCom does seem to be certified for part 95. The grantee code is 2AIOQ