Fwiw I just put a 28khz furuno black rubber block transducer for now its just sitting in the bilge shooting thru. Also A 200kHz rubber transducer on the same unit, shooting thru. The 200 i mixed 5 min epoxy and just stuck it down. The 28 is just floating around untill i figure out prime location, but where it is now is pretty great. The pic is great. I plan on making a box/ well this winter it can sit in with saltwater.
My point is shoot thru might be another option to consider
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