Rex
Dignified but Approachable
The problem doesn't exist when there's nothing connected to the input jack, and it's there when something is plugged into it, and it's there like crazy when your guitar is plugged in. That means it's an interference issue—crud is getting into your guitar. You can chase ground problems all day, but grounding isn't the problem, and solutions like Ebtech, which only address ground issues, aren't going to help.
And if you're hearing a buzzing (as opposed to hum), it's always interference—again, grounding isn't the problem.
You need to find the source of the interference. Start turning stuff off all over the house; shutting off entire circuits at once at the circuit breaker will help speed up the process. If the source is in your house, you'll eventually find the culprit.
And if you have those newfangled "curly" florescent bulbs, they are almost certainly giving you grief. They're noisy as hell.
And if you're hearing a buzzing (as opposed to hum), it's always interference—again, grounding isn't the problem.
You need to find the source of the interference. Start turning stuff off all over the house; shutting off entire circuits at once at the circuit breaker will help speed up the process. If the source is in your house, you'll eventually find the culprit.
And if you have those newfangled "curly" florescent bulbs, they are almost certainly giving you grief. They're noisy as hell.