Barry wrote:Second Streaker's suggestion, try to keep it a couple feet away from your power lines going out to the shed.
Or run shielded CAT5, I did that in a police station a while ago because the RF from the cruisers and the stations base radio was interfering. Worked well. No problems after that was done.
It's a little more expensive, but if you're forced to run near power lines it's worth it.