@Imagineer 

Tha MAC address filtering will not affect the strength or reliability of your connection.

Given how the area has interference, it probably would be best to go for CPE510s which work off of the 5Ghz band so you should not have to deal with the interference your getting working off of the 2.4GHz. 

Here is a FAQ that we have which talks about set ups with our CPEs: https://www.tp-link.com/us/support/faq/1226/

One thing to note is that CPE devices are business products in which case you can get additional help from our SMB forums which are located here: https://community.tp-link.com/en/business

To restate my question:

Does MAC filtering affect displayed RF strength on Antenna Alignment,

or

does the display simply show a composit of EVERY signal on the spefied channel.

Reason being that my display strength is sometimes greater when I have most difficulty with interference.

Being an RF engineer I understand that changing polarization will result in a 20dB reduction in cross polarized signals.

I could easily change from vertical polarization to horizontal and get a 20dB reduction in competing signal interference with no additional cost.

If the TL-WA701ND used an FM modulation scheme in it's design it would have a CAPTURE effect which means strong signal is the only one decoded.  The modulation scheme isn't advertized... QPSK, AM, PSK ?

Changing polarization will be my next step as there is no reason to believe that surrounding WiFi signals are dual polarization.  Generally either one or the other with preference being VERTICAL.

A little searching provided the answer on mod.  QPSK does not exhibit the capture effect seen in FM modulated signals.

I am pursuing the polarization change to horizontal.  I'll run a test on the client end first... and if the "background signals" all take a 20dB hit... I'll know my idea will work.  Most of the interference is 12 to 18dB below the desired signal from my grid dish antenna.

The little yagi beamwidth is pretty broad, which means the advertised gain is also likely more like 12dBi than 18dBi.  The conversion between dBi and dB being -2.71dB.  Isotrophic readings sell more product because the uninitiated believe they will get ALL THIS GAIN.  It's a measurement used throughout industry.  Isotrophic is a point source type measurement where the Inverse Square Law prevails.  Each time you double the distance... you loose 75% of your previous signal level.

Neither strength nor reliability was an issue... just wondered if the MAC filtering kept other than approved signals from being measured.  I see you avoiding the question by changing the subject... you must be a politician.

I've already invested a fair amount of time installing the 2.4GHz system.  Should I be able to make it function I'll be ahead, and not holding extra equipment which would be worthless.  I believe part of my momentary display lock up is related to camera viewing software.  So as the Onion is peeled, new layers of problems are either discovered or cured.

I do have some Cisco 802.11a equipment that could be pressed into service.  However that is my last ditch...

I have found that TP-Link may be pretty good hardware but their support staff knows less than I do about it's capabiliites and features.  Was hoping to find someone with EXPERIENCE.

Dave