That is normal (to some extent) for a strat. To lessen the buzz you can lower the treble and/or gain on your amp and it may help a little. Also check what else you have plugged in around your amp. Some lights and electrical gizmos will add hum to your rig. A light with a dimmer switch can do it. I'm going to move this question to Steve White's 'ask a guitar tech' thead to see if he's got additional info for you.
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