I've often thought I'd like one too. But on a small boat like ours (DE 16), how and where would you mount the dome? Without a radar arch, which itself is probably expensive, I don't think it can be done. As an alternative, I got a small AIS receiver which is not like radar (it won't see everything out there, only those boats with AIS transponders i.e. commercial traffic and yachts), but I find it to be really helpful. It's the big ships that are the scariest anyway - they probably can't see a small boat like mine, can't turn fast, and they need a mile or two to stop. The whole setup cost me less than $200. It connects to my chart plotter and shows all AIS targets from as far away as 20 or 30 miles. It actually provides better information than radar. In addition to a proximity alarm, it shows the vessel's speed and the CPA (closest point of approach) and all the information about the vessel that you would need to contact it by radio (name, MMSI).