Question about how to expand a WiFi signal 150ft?

The best way is to trench a cable over there, but that's probably not cost-effective and maybe not feasible.

There are two basic approaches to getting service out there wirelessly. One would be to mount an access point to the exterior of the house and hope it blankets the barn well enough (or hope that it provides enough coverage to locate a meshed wifi unit in the barn to strengthen the signal). The other way, and the method I recommend, is to use a pair of point to point radios, one on the exterior of the house and one on the barn. Then in the barn you'd run a cable to a wifi access point. These point to point radios end up working pretty much like a wireless wire.

If none of this makes sense I might be back later tonight or tomorrow to explain and add some product links. Or maybe someone else will do it.

Adding a wifi bridge will cut the avaiable bandwidth in half for each 'hop', so streaming over a bridge may be problematic depending on the usable frequency (2.4 vs 5ghz) and attenuation.

Might want consider just adding an external antenna (panel or yagi type) to an access point at the house and see if that works or is acceptable. If possible borrow one to test.

A colinear omni placed as high as possible would work as well, however would extend coverage to areas beyond the desired location (may or may not be acceptable).

A 2.4 Ghz antenna close enough to twice the electrical length of a 5gz to be negligible at these power levels so they are pretty much interchangeable (1/4? @2.4ghz vs 1/2? @5ghz).

Is this something you’re referring to?

LINK

I have a similar situation. I had google wifi with 6 pucks and had a garage between my house and mancave. With a puck in the garage and one in the mancave, I could get a signal in the man cave but it started to get iffy and only got about 25Mbps down. I bought an orbi mesh system (Orbi RBK753S AX4200) My shed is about 100 feet from my house.

I have gigabit service and get 250 down with no hiccups out in the shed. My house is 2800 square feet. I have the router on the South end of the house, a puck in the North end of the house and one in the mancave. Works like a champ. Running the cable would be the best option for sure, but this worked for me.

Might be overkill, but we used these to push internet out from our main building to a smaller building on our church property. Works great as long as you have line of sight.

LINK