How to stop the reciever from searching for Wireless Networks?

You cannot turn off the WiFi itself. All you can do is reset the network defaults so it forgets the name and password of a connection.

Any connection has to be done from the Genie (HR54) itself. You cannot tell another device to connect with the Genie as it is not designed to receive a connection request.

I understand the frustrations of having an older relative who does not or cannot comprehend the current state of technology so locks in a falsehood in their head. I wish you luck.

The built in WiFi can only be used to connect to the internet, it can't broadcast the DTV video/audio signal and it only searches for the internet when you try to connect it.

I just want to also add, the entire family including me explained what WiFi is and how it works. That those signals he sees are not broadcasting anything to anywhere or connected to this Directv reciever. My uncle refuses to listen which is why I want to know if there is a work around. He wont listen to Directv experts either since hes so convinced.

https://www.mirasafety.com/blogs/news/faraday-cages-guide?nbt=nb%3Aadwords%3Ax%3A20632116205%3A%3A&nb_adtype=&nb_kwd=&nb_ti=&nb_mi=&nb_pc=&nb_pi=&nb_ppi=&nb_placement=&nb_li_ms=&nb_lp_ms=&nb_fii=&nb_ap=&nb_mt=&nbt=nb%3Aadwords%3Ax%3A20632116205%3A%3A&nb_adtype=&nb_kwd=&nb_ti=&nb_mi=&nb_pc=&nb_pi=&nb_ppi=&nb_placement=&nb_li_ms=&nb_lp_ms=&nb_fii=&nb_ap=&nb_mt=&utm_term=&utm_campaign=PMAX-Google-US-NB-PROS-PMAX-DSA&utm_source=adwords&utm_medium=ppc&hsa_acc=7747104395&hsa_cam=20632116205&hsa_grp=&hsa_ad=&hsa_src=x&hsa_tgt=&hsa_kw=&hsa_mt=&hsa_net=adwords&hsa_ver=3&gad_source=1&gclid=Cj0KCQiAu8W6BhC-ARIsACEQoDBsFnxSvEIk04A90lLm7l9Tw-YEzFiZjMu4eYcx7L8GLMh17VF_324aAm1LEALw_wcB

If your uncle refuses to listen and thinks he knows different than the company, independent experts, or just the world in general then sorry I don't have any solution. Unless it is an issue that requires treatment, he is only stubborn for stubbornness sake.

@JMonte Set up new wifi network names with new passwords.

The only way -is to direct connect a LAN cable from your switch or ROUTER -once that connection is made it will no longer look of any wireless connection.