The Bolt OTA has 4 tuners, and always reserves one for itself. This means only 3 of the 4 Minis can borrow a tuner to either watch live TV or set up a recording. All five devices can stream at the same time. Adding a new Edge would allow all the Minis to have a tuner simultaneously.
If you get an OTA edge, you can use a splitter to share the antenna between the Bolt and the Edge. This will reduce the signals strength at both boxes, since about half of the received RF power would go to each device. This might work fine or it might require an amplifier for the antenna, it just depends on your location and how good your antenna is. You can use separate antennae for the Bolt and Edge if you get good reception from small/cheap antennae.
The Edge for Cable is cable only, it cannot tune to OTA signals from the antenna. Cable and OTA don't mix, in the sense that signals from both sources can clash if placed on the same coax. If you are using MoCA, and want MoCA on all of your devices, there are some special games you can play using diplexers so that every Mini can access recording from either the Bot or Edge (and so that the Bolt and Edge can each access recording from the other).
If you get an OTA edge, you can use a splitter to share the antenna between the Bolt and the Edge. This will reduce the signals strength at both boxes, since about half of the received RF power would go to each device. This might work fine or it might require an amplifier for the antenna, it just depends on your location and how good your antenna is. You can use separate antennae for the Bolt and Edge if you get good reception from small/cheap antennae.
The Edge for Cable is cable only, it cannot tune to OTA signals from the antenna. Cable and OTA don't mix, in the sense that signals from both sources can clash if placed on the same coax. If you are using MoCA, and want MoCA on all of your devices, there are some special games you can play using diplexers so that every Mini can access recording from either the Bot or Edge (and so that the Bolt and Edge can each access recording from the other).