Not sure if it will help, but here are a few suggestions:

I'm don't know if there a high demand for it, but perhaps you can sell amateur radio equipment on your site via an affiliate program.

To get more people to your site, introduce valuable resources for amateur radio enthusiasts.

Categorise a list of amateur radio stations and clubs, and provide a list upcoming events. I don't know if you are specialising in amateur radio within India only.

Of course, you can also introduce banner ads and AdSense etc.

Best of luck!