20M Window Loop Stealth Antenna Construction Guide
Description
This resource provides a construction guide for a 20-meter window frame stealth antenna, based on a design by PD7MAA. The antenna utilizes a single 620cm wire loop, configured for discreet installation within a window frame. The technical breakdown details a feeding mechanism employing a 4C65 toroidal core, where the antenna loop acts as a single-turn secondary and the feedline wraps twice. Tuning is achieved via a 30cm twisted wire stub, allowing for SWR adjustment within the 20m band. The design is specified for QRP operation, with a maximum power limit of 25 Watts to prevent core saturation or arcing. Wire selection recommendations include thin, insulated copper wire (0.75mm to 1mm) for blending with architectural elements. The guide focuses on practical construction steps for a low-profile 14MHz antenna.