Use the "Amplify" and "Low/High Pass Filter" effects to thin out your voice and add static.
To make modern audio sound like it’s coming from a 1940s console, you need to strip away the "fullness" of the sound: Old Radio Sound Effects
Add a small amount of "grit" or "warmth" using tape emulation or a distortion plugin. Use the "Amplify" and "Low/High Pass Filter" effects
Sites like Envato Elements or Zapsplat offer extensive libraries of royalty-free radio effects. 2. How to "Old-ify" Your Voice Old Radio Sound Effects