PBY5-5A aircraft used ASV radar, information source is Pacfic War On-Line Encyclopedia...
http://pwencycl.kgbudge.com/P/b/PBY_Catalina.htm A quick summary of British ASV radars .....A notable improvement was achieved with what called Long Range ASV. LRASV was based on the second antenna configuration developed. It was a sideways-looking system. The transmitter was an array of ten dipoles, installed in five (later reduced to four) pairs on top of the fuselage of the aircraft. The receiving antennas were
Sterba arrays, fitted to the sides of the fuselage. Because the transmitter array was a dipole array 18 feet long and the two receivers were arrays 12 feet long, a much better resolution and range could be achieved. The first installation was on a Whitley bomber, in late 1939. LRASV had a range 2.5 times better than the forward-looking system; it could detect submarines at 10 to 15 miles.... source of information is...
https://uboat.net/allies/technical/uk_radars.htmToken, the summary states...ASV Mk.II Developed at the Royal Aircraft Establishment at Farnborough in early 1940, ASV Mk.II differed from Mk.I mainly because it was properly engineered, and therefore much more reliable.
Although called a 1.5m radar, it actually used 1.7m (176MHz). Range was up to 36 miles.
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