I use a coaxial trap...RG214 on a piece of 4" thin wall PVC. Trap resonates at 3.45 MHz. 

Looked at using a vacuum relay...lower losses but more complexity.

Pat, W5VY 

From: [email protected] <[email protected]> on behalf of Jussi Eloranta <[email protected]>
Sent: Thursday, February 20, 2025 10:36:38 AM
To: 'ADXA' <[email protected]>
Subject: [ADXA] Get 160m inv L to 80m?

Hi,

I have inv L (with about 80 radials) for 160m (quarter wave length). I am wondering if there would be some good way to get it to resonate also on 80m? Of course one solution would be to install a relay that would make the radiator longer/shorter but a bit tricky to do in practice. Any thoughts?

Jussi (aa6kj)