Back when cable tv was cable tv and we would drive a 12 foot rod with a large pointed lug nut under the driveway with a sledge we would borrow the locators dyna-tel and hook it up this would give us a depth and location. saved a few backs.
any locator should be able to locate the rod.
DANO
This is CABL.com posting #82895. Tiny Link: cabl.co/mvJb