No 5G range with this router?

Thanks for the reply. SHortly after my post, I discovered the nifty WiFi Analytics app, and used it to monitor signal strength as I went through all the channels.  since nothing I could do improved the 5G signal reliably, I finally decided to move the cable modem into my living room by linking a few RG-6 drops I put in back when I built the house (6+ miles' of Cat-5, RG-6, and Cat-3 back in 1997, just before wireless became a "thing"). Also used a Cat-5 network drop to connect to my primary switching hub in the home automation closet for the rest of the house.  With the cable modem hidden behind a plant only 10 feet away from my easy chair, I get 70%  signal strength on 5G and 100% on the 2.4 , regardless of what channel I use.  NOT impressed with the hardware but the problem is resolved. Not solved, but resolved.  I had hoped it would give me better range outdoors for some PZI wireless cameras I have used in the past with the cable modem provided by TW.  THAT's not going to happen unless I drop another run out and add another wifi router, I guess.  One step forward, two steps back.