Wifi Booster Help Please .........

[Gizmonster]

Our router is in our front room and cannot be moved.
I need to get a signal out into the back garden and it's just not happening - the signal needs to go through one solid wall to reach the hallway; then another solid wall to reach the kitchen; through some french windows to reach the conservatory; then finally through a UPVC door to reach outside.
By the time it's reached outside, the signal is quite poor. Once I move more than 10 feet from the back door, the signal has gone - no where near enough to reach the middle of the garden.
I'm after a booster, but there's so many available, it's confusing.
If I get a powerline WiFi booster, does it need to be on the same ring as the WiFi hub itself, or does it not matter??
Would a WiFi extender be enough?? There's a plug socket right next to the back window, so I could plug one in and sit it on the window sill in the conservatory and hopefully (?) it'd be enough?
Any advice please??

[CrapAtCryptics]

Who are you with the range you are getting doesnt seem very good. I often go across to my neighbour 30 yards away and get good signal at the back of his house.

[Gizmonster]

I'm with VM.
I just rang them and they offered to rent us a booster for £3 per month. Not a bad price, but I was told I'd be paying as long as I kept the booster, which could work out quite costly in the long run, so I'd rather buy my own.

[CrapAtCryptics]

Have a look at Ebuyer they have some excellent products at reasonable prices