Reddit reviews RJ45 Coupler in-Line Coupler Cat7 Cat6 Cat5 Cat5e Network Cable Extender Adapter, Support 100BASE-TX (1 Pack)
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Function: RJ45 coupler help extend the connection between two Ethernet patch cables, they are compatible with Cat7,Cat6, Cat5e,Cat5 networkCertified Safe: These RJ45 Coupler meets Category 6 performance, They are TIA/EIA 568-C.2 Verified, FCC, RoHS CompliantSafety: The coupler are gold plated contacts and easy snap-in retaining clip to ensure a secure and corrosion free connectionFast Speed: RJ45 Coupler extender can speed up to 10 gigabite for connecting Cat7/Cat6 Ethernet cableYou can get 1 x RJ45 Coupler and our fan-favorite 18-month warranty and friendly customer service
OK, here's what I suggest...
Find a central location with 2 Ethernet ports (preferably in one outlet or at least close to each other) where you think the RG would provide better Wi-Fi throughout the house. Then make new connections based on this schematic.
This will require purchase of a female-female RJ45 coupler like this one and a gigabit switch like this one. These can be purchased for $20 to $50 depending on the switch. There are cheaper switches than the Netgear I linked to.
I also suggest, before disconnecting or moving anything, that you find the two Ethernet cables in the cabinet from the location where you're thinking of putting the RG. Then connect these one at a time to the switch (yellow ports) on the back of the RG. Plug a computer into the corresponding port in the outlet and test that you have Internet connectivity from that port. Also test the speed by browsing to speedtest.net.