Hello all, first time poster. 

We own a small RV park campground, approx. 3 acres on the river. We have approx. 30 guests at any time. We have 150 Mbps service into the office currently. I'd like to update the current wifi system which was in place when we purchased the park, which consists of a cable modem in the office, ligowave antenna on the roof of the office, and a Netgear router approx. 300 feet away in the bathhouse. The Netgear router is inside the bathhouse, in the roof trusses. So we have our Office wifi, then an access point from the antenna on the roof, then there are two more access points off the Netgear router. Needless to say, it doesn't work so great, and the Netgear is testing out at somewhere around 4-6 Mbps and servicing maybe 20 clients. 

What I would like is faster, more stable connection for those in the back of the park especially. I don't need very sophisticated controls, just the ability to change the password occasionally, like once a month, and check on the system  in the event someone calls to report an outage. I was looking at the EAP 225 Outdoor for this build, and was planning to place one on the roof, and the other on the roof of the bathhouse. I figure just that should improve things. They are approx. 300 feet apart, and line of sight with minimal to no trees between. 

So can the one on the office be made to act as an access point while also sending wifi to the second one? And would I need any other equpment to make this work? To be clear, only the one at the office would be capable of being plugged into ethernet for internet, the second one would be power only. 

Thanks in advance, I'm still learning...