Extend Netgear CG3100 Router network with Airport Express A1088

I have a Netgear router (CG3100) which is in my office and the base of our wireless network. A few rooms to the back of the apartment we have an Apple TV but the wireless connection here is flaky and keeps dropping out so I want to extend it.

I found an old AE base station (A1088) which is good and working - I understand though that this can't extend the Netgear wirelessly as you need all Apple products for that, but it can extend the network when connected by Ethernet.

Been searching for how to do this but can't find any info.. can anyone point me in the direction of some resources/how-to for this or let me know how to do it?

Cheers!