How much money do you want to spend?
line of sight - trees impact performance
More trees - you need more power to punch through if it is possible....
I have setup several long range network with the EnGenius product line.
They are a bit higher price than most, but they also push more power - the one in the link below pushes 800mw, most only push 200 - 400mw.
This is a good product, I had an issue with one of their first generation outdoor cases, it developed a leak in a casting seam, worked with EnGenius directly, fantastic customer service.... they replaced the version I had, and have now changed the design of the casting.
I normally setup 2 of the units, creating a 5 GHZ bridge between the two, and then enable both devices to be 2.4GHZ access points. You can make a wifi figure 8 of about a 1/2 mile in length.
It also helps to upgrade the antenna on certain devices at the other end...
You may not need a long rang repeater - you may just need a better antenna on the device you are using out in your shop.... (cheaper way to go) - see the 2nd link. The tech support group is fantastic
Amazon.com: EnGenius Enterprise-Class Long-Range High-Capacity Wireless-N Outdoor Access Point (ENH210EXT): Computers & Accessories
2.4 GHz 15 dBi Omnidirectional Antenna - N-Female Connector - HG2415U-PRO