I looked on the steps of the instalation, are you sure at the install you didn't skipped the step were it says that you need to detect both wifi`s under same name ? like the picture



NOTE: If you are extending a dual-band network, wait until you see an entry with both of your WiFi names. Select it and click Next. If you only see one radio, click on the refresh button to see if both radios now appear on the same slot.
Otherwise, continue with the setup and you may then be prompted to connect to the second radio. You can always configure your second network after setup in the Basic Settings section of the range extender’s web-based setup page.

Split into two and when I choose 5 GHz it can’t find it.

Define "close"
The bigger factor would likely be do you have other devices on that frequency?

This post was edited by Cascadian on Oct 27 2023 03:29pm

It turns out that version I bought can’t read 5 GHz with 2.4 GHz.

Are you sure? On the producer page it says it supports both

https://www.linksys.com/support-article?articleNum=318159

for RE7350 range extender. have you set it up like in the steps here ?

I have 3 extenders in my house.
I plugged them in next to my modem to connect them and then moved them to blind spots in my house.
This worked and they connect via 2.4

I get around 700-900 around my whole house.
Try that and see if it helps.

Which ones you got that is expensiveest?