The system comprises a drilling apparatus comprising a first portion (111) and a second portion (116). In certain embodiments, the first portion may comprise a bottom hole assembly (BHA) or a drill string, and the second portion may comprise a sensor extension housing. The first portion (111) has a first diameter and the second portion (116) has a second diameter that is greater than the first diameter. The system includes a sensor pair 114) disposed within the second portion and proximate to an outer radial surface of the second portion. A processor is in communication with the sensor pair. The processor determines at least one gradient measurement based, at least in part, on outputs of the sensor pair.