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This VHF 145 MHz antenna is easy to build and with no radials. It shows equal gain of 5/8 lambda. It is light weight, you can hang it somewhere (on a tree may be) and work.

Dual Band VHF/UHF Slim Jim Antenna project

A vertical monoband antenna design that can work from 6 meters to 70 cm by F5ZV in French

Development of the Slim Jim antenna for HF

A Unique VHF Antenna with gain over a J-Pole Jose I. Calderon, DU1ANV

Build the Slim JIM Antenna, a unique VHF Antenna with gain over a J-Pole Jose I. Calderon, DU1ANV

Slim Jim Antennas are great for apartments and hotels. VHF UHF Antennas

The Slim Jim VHF antenna, originally designed by G2BCX, is a folded half-wave dipole fed by a quarter-wave matching section. This version, built from a recycled professional aluminum dipole, demonstrates that various materials—such as copper, brass, or twin-lead—can be used. The article details the antenna’s construction, required materials, and tuning process, emphasizing mechanical stability and ease of assembly. With proper adjustment of the feed point, it provides excellent SWR across the band. Its durability and simplicity make it a practical and efficient VHF antenna solution.