Thank you Rick. I find it interesting that there is no evidence of air search radar on the LSDs. Most of their defensive armament is anti-air. I guess they relied on the ships around them.
I don't have detailed answers for which radar(s) that every individual LSD unit may have carried throughout WWII. But from this image of USS OAK HILL (LSD-7), dated 21 April 1944, she had just a Surface Search Radar (and NO Air Search Radar) of a type that smaller units had installed. I wouldn't be surprised that the Surface Search Radar installed on LSD's varied depending on when a particular unit was completed and the development "maturity" of such radars in development. The smaller Surface Search Radars fell into two groups (as noted in a October 1943 document I have, additional radars were in development as well):
Group B (medium size vessels like older DD's, DE's, and PF's); SE (replaced by SO), SF, SL, SJ, and SU
Group C (small size vessels); SO, SE, SF, SL
I have not studied the smaller radar antennas in detail to where I can ID them visually, but they would "likely" be one of the types listed above. Some of these radar antennas are enclosed in a fiberglass cover more or less cylinder in shape, as seen in the linked image. The radar seen on USS OAK HILL, rules out the SE, SJ, and SN. SF and SO radars are the most likely candidates.
To get an EXACT answer, would require going through technical data in BuShips records, specifically departure reports, at NARA, which isn't possible right now.
Does anyone know what radar(s), if any, were installed on Ashland class Landing Ship Docks during WWII?