We've had "value of dual VOR" and "value of DME" discussions, so now let's talk marker beacons. Suppose the plane were going in for a panel upgrade and/or other avionics work: If you had a working marker beacon receiving system, would you remove the antenna to cut weight and improve aerodynamics? If one of the components were not working, would you have it fixed? Or would you remove the antenna and/or render the receiver inop? If you had a receiver but not an antenna, would you install a new antenna? If you didn't have a marker beacon system at all, would you install a whole new system?