Hollow vs Solid radials

I have been searching the wiki here, and in general for opinions regarding the reception capabilities of discone radials. I have several discones and one is hollow aluminum that I have had for more than 20 years. I cannot recall the brand. I am concerned that the hollow aluminum is inferior to the solid radials. It seems that way when I place different scanners onto that discone. Can someone please refer me to a site to learn about this issue, or let me know what they think, Thank You