Anyone getting blocks of $5 notes can easily obtain a set of 4 consecutive radars so in this case they are not that rare.
Also, it would appear to me that the market on radars has not done as well as it has in the past, likely because of some flooding of large quantities of radars by some collectors.
If someone had matches to any of the numbers, that would bring some interest I would think, even in my case, but I really don't see much of a premium in a set of 4 consecutive radars.
Bottom line is that unless you have something that someone really wants and doesn't think that thy can pick up again....I don't see any great potential for interest.
Obviously the set with the repeater would likely be more in demand than to other.
As always, only my opinion.
FRIEDSQUID