HARADA B-57 Antenna Base Only - Set for Roof and Trunk

HARADA B-57 Antenna Base, Metal, for Amateur Radio.

- Brand: HARADA
- Model: B-57
- Type: Antenna Part
- Connector Type: SMA Connector
- Material: Metal
- Use: For Amateur Radio

Includes base and cord, but no antenna.
Purchased several decades ago when it was popular to attach them to cars and drive around, regardless of whether you had a radio or not. However, I ended up not using it, stored it away, and left it there.
I am an amateur and know nothing about dimensions or specifications, so I apologize for relying solely on the images. However, I believe those who are somewhat knowledgeable will understand, so I am listing it now.

Thank you for looking.