@lordlance 

You mentioned speed of 35 mbps.   Most modern phones and laptops only have 1 aerial.   35 mbps it typical speed for 2.4 ghz wifi.

Connect a computer to ethernet port on WPA-4220 extender and perform a speed test.   50-60mbps is considered good for AV500/600 poweline products in my experience if your property has good wiring with minimal interference from electrical appliances (eg. UPS etc).

@bob888 I've tried plugging in the ethernet to the TV. Same speed.

@lordlance 

You could use the TPlink powerline Utility to check the link speeds between adapters.

But TBH, if measured ethernet speed is 36 mbps, then it is as good as you'll get for your property's electrical wiring and electrical noise.

Perhaps try removing the UPS and see if speeds improve if electrical noise is causing the problem.  Then try moving the adapter to another wall socket in the room further away from the UPS.

If you examine the consumer unit (fuse box), you may be able to determine if the router and TV are on the same ring mains.  Performance is usually a bit better if the adapters are on the same ring mains.

At end of the day, powerline products are a product of 'convenience' to avoid drilling holes through walls and laying ethernet cables.  They are not a substitute for hard wired ethernet cabling if best speed and reliability are important.

@bob888 I just need ~60Mbps speed on my 100Mbps connection. What should I do? I am my wit's end. I have tried range extenders, tried different Wi-Fi settings and had my router replaced twice (for different reasons.)

I was told having two routers on the same connection can cause issues?

@lordlance 

For wifi, you should be using 5 GHz wireless for speeds above 30 mbps.  5 GHz wifi signals have much shorter range than 2.4 GHz.

For ethernet, try 1000 mb powerline adapters, look at mesh wifi solutions, or simply bite the bullet and do things properly by installing ethernet cables to rooms where higher speeds required.

@bob888 5Ghz can't reach my living room from my room unfortunately. Mesh systems are very expensive.

@lordlance 

fwiw, I'd personally just lay an ethernet cable to the room, and if wifi is required, install a wireless access point on the end of the cable.

eg. Archer C50 or A5 AC1200 router offer Access Point mode.

You can also buy a USB to ethernet adapter for the newer Amazon Fire sticks.

@bob888 WAP is how routers give WiFi? Or is it different?

If I installed two routers would I have an issue?

@lordlance 

You can install as many wireless access points as you wish provided their wifi do not interfere with each other.  In a 'normal' network, there is just one 'router' which is used to connect the network to the internet service.

Routers such as Archer C50 offer 'Router' and 'Wireless Access Point' modes.  

Look up the C50 emulator and click on 'Operation mode'

TPlink emulators

If you do choose to install a cable, you could just buy flexible patch (multi-stranded wires) cable with or without plugs on the ends.  Note if you buy a cable with premoulded plugs on the end, you will need a big hole(s) in the wall to safely push the plug through it without damaging the fragile plug!

Alternatively, a better professional option is to install RJ45 wall sockets which use 'solid core' pure-copper ethernet cable. Some advice here.

youtube video for cat 6 wall socket wiring

@bob888 So it turns out that my TV does indeed have an ethernet port. That simplify things. My question now is that since they are in different rooms the wire will be sent from my room to the roof back to the hall outside. Do I need to install another fibre cable or can I use a very very long ethernet cable? The distance might be roughly 100 feet (room to roof, back to my hall.)

Can two fibre wires be installed for the same connection from the roof?