@fdb, it should point to the source CPE and to the destination CPE which is possible only if both are inside the 65º angle of a CPE's antenna beam width.

However, you will run into the Hidden Node Problem (HNP) anyway if using Repeater mode. Also, Repeater mode cuts the wireless throughput by half and the HNP will further decrease throughput. Repeater mode is fine for home use, but not in professional scenarios.

Second best solution would be to operate the CPE in the middle in AP mode, not in Repeater mode. The other two CPEs at source and destination then need to run in Client mode. This setup allows to turn on MAXtream which eliminates the HNP. However, wireless throughput will still be cut in half with this solution, too.

Therefore, best solution is to use two CPE in the middle connected by a cable, one directed to the source CPE and the other directed to the destination CPE. In this topology the two CPE in the midst form a relay. No HNP, no loss of throughput.

BTW: there is an own subforum for questions related to Pharos products.

fdb wrote

But since I have you... a bit more info?  Two CPE's in the middle is quite doable.  But how would they be configured?  The one pointing at the source would be a client (right?), cabled to the second one, which would be... an AP?  Then the forth unit, the destination, could be a bridge, so as to broadcast its own SSID? 

It doesn't matter which on is client or AP since the WiFi role will only affect inital connection, but will not affect bi-directional communication. For every directional link one CPE must be in AP mode and one (or more) must run in Client mode.

Why would you want to run the destination in Bridge (Repeater) mode? CPEs are not well suited for supplying a WLAN to standard clients; they are designed for directional WiFi links over very long distances.

If you want to supply a remote destination with WLAN, consider using an AP with omnidirectional 360º coverage (e.g. EAP110-Outdoor or EAP225-Outdoor). In such a topology the CPEs are used as the wireless backhaul and the EAPs are used local distribution.

If you can live with a small beam width of only 65º coverage of a CPE, you could use Bridge mode. But as I wrote already, this is no professional setup. You will run into Hidden Node Problem and loss of throughput. In my opinion a repeater causes much more troubles than what's worth the savings by combining two different use cases into one device only (and I have lot of bad experience with repeaters in business areas).