Arrays of K9AY Loops: “Medium-Sized” Low Band RX Antenna Solutions (PDF)

How to Make a Great 9:1 RX Transformer

How to Build the K9AY Loop Receiving Antenna (HTML)

How to Build the K9AY Loop Receiving Antenna (PDF)

K9AY Loop FAQs (Frequently Asked Questions)

Beverages: How Short Can They Be?

How to Get the Most from Attenuators and Preamps

My Experience with Beverages on 40 Meters

Circuit Diagrams (PDF files):

Filter/Preamp used in the AYL-2, AYL-4, PRE-1 (1.8 - 4.5 MHz)

Filter/Preamp used in the PRE-2 (1.8 - 8 MHz)

Instructions for Old Products (PDF)

AYL-4 Instructions - Original version without adj. termination

AYL-4 Instructions - Updated version with adj. termination

RIP-1 Receiver Isolator/Protector