It's not 5G antenna, it's 5Ghz.
5G is the fith generation of mobile network tecnology and should not be mistaken with frequency band of wifi networks.
Where are the no-go areas above and below board? No dissipated power ratings? It looks like a lot of silicon, but it's just a small board maybe. O noes commenting I can't even scroll back up to tfa...
[looks at home router] 4 ethernet ports, plus 1 dedicated to Internet. WiFi antennae.
[looks at new product] 2 ethernet ports, 1 must be used for Internet. WiFi.
I think my current home WiFi router is safe for now.