To get the full benefit, it really does need to be in the guitar or very close. Typical quality guitar cords have capacitance of around 30 pf per foot so even a good 10 foot cable will have an audible reduction in the highs for a passive guitar.
If you don’t want to put it in the guitar, I would suggest getting a buffer from waldotronics, or build your own, and put it in a small box on the strap with a short 1 foot or so patch cable.
There are a bunch of buffer/boost pedals, but none of them can put back what gets lost before the input.
Last edited by Chocol8 on Tue Jun 08, 2021 12:37 pm, edited 1 time in total.