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Many of the PBJ-1C and D versions carried a rather ugly, bulbous antenna for an APS-3 search radar sticking out of the upper part of the transparent nose. On the PBJ-1H and J, the APS-3 search radar antenna was usually housed inside a ventral or wingtip radome. Some PBJ-1Js had their top turrets removed to save weight, especially toward the end of the war when Japanese fighters had become relatively scarce.

Source :
https://en.wikipedia.org/wiki/North_American_B-25_Mitchell

Maximum reliable ranges: surfaced submarine (broadside), 20 miles; 4,000-8,000 ton ship, 40 miles; well-defined coastline, 80 miles. Minimum range is 200 yards. Range accuracy, ± 1%. Covers 160° in bearing, with accuracy of ± 3°. When 60° of bearing is expanded on scopes for torpedo-laying, accuracy is ± 1°. elevation limits are +9° to -9°.

Source:
http://www.history.navy.mil/library/online/radar-10.htm