FWIW, I put a Furuno 1623 on my 20' CC for about $1000. It, too, has an 18" radome @ 2kw with 5.9 (I think) degree beam, about 11' in the air on the T-top. It works great and saved my bacon one night last summer coming home at 3 am in the soup.
I wish it was a 6 kw 1.2 degree unit, so that I could spot birds and count the boys and the girls. But I didn't have a spare $7500 to throw at it.
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