Bart,

Thanks for the advice on the QRT-5.  It looks very nice; I might upgrade to that.  With my vertically polarized sector antenna I found -77 dBm this afternoon, and when I rotated the antenna 90 degrees (now horizontal) my best was -88 dBm.  Again, this is a line-of-sight path at 5 feet above the ground (possible Fresnel-zone problem?).

Today I had good results with my  MikroTik Metal 5SHPn transceiver modem (reprogrammed with v6.32.3) and the sector antenna.  This time my connection attempt was mostly okay!  I could see network activity on tool > traceroute 8.8.8.8 (see attached), and I could ping google.com, averaging around 80 ms (median about 40 ms).  However, I could not get an IP address from the network. Any ideas why?