Hello, just thought I'd add my two cents. I used a 50-foot web lead when walking my basenjis in a lovely park with rolling hills that is close by. My dogs loved the freedom and quite honestly, I wasn't interested in having them off lead. Both dogs had very strong prey drive and they'd see a squirrel and that was it. Squirrel chasing is better than treats!
I have a nylon 50-footer that I use on the beach with my guy, same thing, he can run and play but it's almost impossible to call a dog and have the dog hear it with the sound of the ocean and waves breaking
That said, I wish you good luck in training your b to walk off leash to be able to enjoy a walk in the woods. Please give us an update when you've gone on your first adventure.