I'm not at all clear about what happens at the source-end.
Is the data input to the barber's-end CPE hard wired?
Or do you need to pick it up (by WiFi?) from a tower 700m away?
Is that why the WiFi router (with higher gain antennas) is needed?
If so, assuming router normal range of 10m is correct, for 700m range you will need 20*log(700/10) = 37dB of additional router antenna gain.
35DBI 3G 4G LTE TS9 Antenna HUAWEI
Will just do the job? .... A bit marginal at 2dB short! .....The other 2 antenna prospects certainly will not do 700m.
You need to check that 10m normal range and 700m tower distance are both correct.
I apologize. I think I may have confused the issue here. I am talking two different ways, in order to secure my internet connection. So that everyone is on the same page, and in hopes of not confusing readers any further, let me see if I can explain something a bit better.
One unit is a single WiFi SIM card router, a HUAWEI E5573s-856, which can be held in the palm of your hand. It is a small unit that uses an internal rechargeable battery (by USB charger), and a SIM card, that will receive a signal from some distance - up to several kilometers away, broadcast from a cell tower. It then rebroadcasts that signal, in the form (frequency range) of WiFi, so local devices within 10 meters can log on, just as they would if connected to any other WiFi router. This particular unit, though, is limited to four (4) devices simultaneously connected. Bandwidth is limited by the size data credit package you purchase, in order to load the SIM card. Typically, this would be in the form of a 4 to 6 Megabits package. Once the data credit has been consumed, the SIM will have to be removed from the device and reloaded with data credit again.
The other, and my primary choice way to connect internet at the farm, would be via my two CPE-510s. They are significantly larger than the HUAWEI E5573s-856, each about 22cm long. One would be mounted to a pole above the tree line, and hardwired by way of CAT 5e or CAT 6 Ethernet cables, to my modem / router. Metfone, my internet provider, would supply the ADSL line at one of the locations just off the highway. (Hopefully, the locations in question would either be at the barbershop, or at the home of the barber.) The CPE-510s are powered by way of POE (Power Over Ethernet), which, basically is using two of the wires within the Ethernet cable to carry a DC voltage signal from a power point, to the unit on the pole. My modem / router would be connected to Metfone's ADSL line, by way of an R11 phone jack.
The other CPE-510 would be mounted on another pole, which would be located at the farm. It would be hardwired the same way the first one would be, via Ethernet cable. Each of these units would be pointed toward each other, or directed toward each other as close as possible, so they would transmit and receive the best signal available, to each other. My local WiFi router at the farm, would then be able to broadcast a wide signal, certainly much wider and stronger, than the WiFi signal from the HUAWEI E5573s-856 would be able to broadcast. Not to mention, I would not be limited to the number of simultaneously connected devices, either.