During a brief refit in HM Dockyard, Rosyth, Scotland, from 24 August to 10 September 1940, the Type 79Y radar was upgraded to a Type 279 system and two Oerlikon light AA guns were installed on the roof of 'B' turret. While "Rodney" was refitting in the Boston Navy Yard in the United States in June–August 1941, the Oerlikons were replaced by a quadruple two-pounder mount and a pair of octuple two-pounder mounts were fitted in lieu of the aft six-inch gunnery directors. In addition a full suite of radars were added. A Type 281 radar replaced the Type 279, a Type 271 surface-search radar was installed as was a Type 284 gunnery radar on the roof of the forward main-gun director. The ship's light AA armament was heavily reinforced during a refit in February–May 1942 with seventeen 20 mm Oerlikons in single mounts added to turret roofs, the superstructure and the decks. The quadruple 0.5-inch mounts were replaced with Mk III "pom-pom" directors and three additional Mk IIIs were installed to control the aft octuple two-pounder mounts, all of which were fitted with Type 282 fire-control radars. The HACS Mk I was replaced by a Mk III director and four barrage (anti-aircraft) directors with Type 283 radars were added for the main guns. In addition her radar suite was upgraded: the Type 271 radar was replaced by a Type 273 system, a Type 291 early-warning radar was added and a Type 285 fire-control radar was installed on the roof of the HACS director.