Furuno RSB0071-058 24-Inch 4kW Radome Radar Antenna Assembly

The RSB0071-058 is Furuno's replacement antenna radiator assembly for their 24-inch, 4 kW radome radar. If the scanner up on your mast or radar arch has quit, this is the genuine Furuno part that brings it back to life. Furuno part number 008-476-610. It's the same radome-class antenna that shipped on a whole run of Furuno's compact pulse radars, so getting your picture back is usually a straight swap rather than a full system replacement.

Here's what you're looking at. A radome radar hides the spinning antenna and its magnetron transmitter inside a sealed dome. Nothing sticks out to snag a jib sheet or a fishing line, which is exactly why radome scanners are the go-to for sailboats, small trawlers, and center consoles where an open array would be in the way. The RSB0071 is the 24-inch, 4 kW version of that setup. Four kilowatts of transmit power is plenty for the kind of coastal and nearshore work these radars were built for. Picking up buoys, other boats, a squall line rolling in, or the shoreline when the fog drops.

This antenna unit pairs with a specific family of Furuno displays. We've seen it used on the 1721, the 1731 MARK-3, the 1732 and 1732C, the 1734C, and the M841 MARK-2. If you're running one of those and your radar went dark, a failed scanner is one of the most common culprits. Confirm your display model first, then match the antenna to it. The display and the antenna talk to each other over the signal cable, so as long as you're staying inside that Furuno family, the swap keeps everything talking.

When does a scanner need replacing? Usually it's water intrusion. These domes live in the worst spot on the boat, up high and taking every bit of spray, sun, and weather. Over enough seasons a seal gives up, moisture gets in, and the antenna or the magnetron inside starts to fade. You'll see it as a weak picture, missing returns, or nothing at all while the display itself still powers up fine. If your head unit boots and self-tests but the radar image is gone, the scanner is the first place to look.

A couple of things worth knowing before you order. This is the RSB0071-058 radiator assembly, Furuno 008-476-610. The RSB0071 radome family has a few closely related sub-variants that were matched to different display generations, so check this exact part number against your scanner's parts list or your Furuno dealer before you buy. You don't want to end up with a near-miss. And buy it new. There's a lot of used, pulled, and gray-market radar gear floating around out there, and a marine antenna that's already lived a hard life on someone else's boat is a gamble you don't need to take. This one's a genuine new Furuno part.

Installation is a scanner-unit job. The antenna mounts up high with a clear view around the boat, and the signal cable runs back down to the display at the helm. If you replaced a matching unit, you're reusing the same mount and the same cable run, which keeps the job clean. If you're comfortable working aloft and pulling a cable, plenty of owners handle this themselves. If not, any Furuno-savvy installer can knock it out. Either way, you're back to a working radar without repowering the whole helm.

One more note on matching. Furuno built these radars to be simple and dependable, and the antenna is a big part of that reliability. Get the right RSB0071-058, mount it solid, seal the cable gland well, and it'll ride out plenty more seasons. If you're not sure whether your radar's trouble is the scanner or the display, give us a call. We're happy to help you sort out which part you actually need before you spend a dime.