Wanting ethernet 400ft away

Ethernet cabling would probably have a better chance of crossing that distance than wireless but it would have to be sunk in the ground under the driveway in a pretty sturdy duct. The cost of wireless equipment to cover that distance would be extremely high.

We have covered that distance for our customers with wireless.
An example is a gas station kiosk connected to the parent supermarket.

Look at this equipment for starters:
http://www.netgear.com/Products/APsWirelessControllers/...
http://www.netgear.com/Products/APsWirelessControllers....

Wired Ethernet has a 100 meter limit without equipment to repeat or boost the signal.
Fiber is expensive but can be used over much longer distances.

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Sorry - read feet as yards but the last time I tried this in England from the products available at the time, I was hard pressed to get over 50 yards. [#2a00ff]

would a accesspoint like the netgear wg103 work with my motorola, or would I have to get 2 like aps the same to configure them correctly? I will have no pc in the barn.

The two devices need to be connected in bridge mode.
You will see bridge mode listed in the WG103 specifications.
We have found that it is much easier to accomplish if both are from the same manufacturer.

Not all devices are bridge capable.

Maybe if your Motorola is bridgeable you can find another Motorola to match.

A better external antenna can really improve the range.
But, your device must have external removable antennas like the WG103.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Also the WG103 only has one Ethernet port on the back.
If your cameras are wired you will need to add a Ethernet switch to the access point.

thanks for the advise, I will give it a try.