GND (GND electrode cannot be attached to the bone) cannot be removed because the reference cable is short. Do you have a long reference cable?
Which product are you talking about? Link plz.
I purchased and am using the Reference cable at the following link
URL: https://www.sparkfun.com/products/19244
However, I feel inconvenience in using the cable due to its short length.
To solve this problem, I would like to have a long reference cable.
Where can I buy a long reference cable? Or do I have to make it by myself?