Scott Varn
Q. Can you recommend the best router for providing Internet access to a barn some 300-feet from my house? There are several trees that could interfere with the signal. - Nancy, Indiana
A. This is a common question. The technology you choose is more important than the router brand. Make sure you are using a 802.11g. There are faster, longer range technologies on the horizon but currently this is the best for a reasonable price. But just because you are using a “G” network router does not necessarily mean you are taking advantage of all its bandwidth. Since a G network is backwards compatible, it will work with older (shorter range) network cards in older computers, i.e. 802.11 a, b. So make sure all computers have G network cards to ensure maximum connectivity.
Now for the bad news, 300 feet is a bit of a stretch. The official range is 38 meters (124 feet). Under ideal situations, I have seen it go further but more often it is less.
My best recommendation is to pass on wireless. A hardwired cable between the two buildings is the best way to go. A cat5e cable can easily make it 300 feet and will be faster and more reliable. You can get a spool of cat5 from a local electrical supply house for a reasonable price. Whether you plan on burying it or hanging it from poles, get direct burial cable to insure there will be no corrosion.
Running a cable may seem like more work but it will be far less aggravating and much faster.

Surprised you didn’t say wireless N (802.11N) which has gone standard and should reach 300’. If not, he could put a repeater somewhere where he has power.
What about a cantenna setup? What’s the spec on 5E or cat 6?
What about Satellite Internet? Tht could make sense in a scenario like this.
What’s wrong with 802.11N? It has twice the range of G and is readily available.
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Ruckus Wireless controller-based unified system. Use one ZoneDirector 1006 and two 7762 outdoor access points. One ap hard wired to the system and the other ap runs on SmartMesh.
I will bet you steak dinner that this will work and if we all tried to implement our ideas, I’d be the first one to finish :)