On ours we have two sheaves mounted under the spreader, moving the 'down' line away from the reflector and avoiding the edge chafing(more like cutting) through the line.I have the standard aluminum Davis Echomaster Deluxe. It is attached to a spreader halyard on the port side. The Deluxe model has the ability to run the hanging line through the center so it is always in the rain-catch position. No worries about line chafe either.
See the photo below. This one is not setup properly. The line should be led back down through the center. Unfortunately I could not find a photo of one properly mounted.
IMHO - This is worth reading, no matter which RADAR reflector you own or are contemplating owning:Also, don't expect too much from the reflector. Study after study says they help but not by much.