RW4HFN Balcony Antenna for the 20-Meter Band

For amateur radio operators working with limited space, especially in urban settings, the RW4HFN balcony antenna offers a clever and compact solution for operating on the 20-meter band. This design is particularly suited for installation on balconies or small terraces, making it ideal for apartment dwellers or those with HOA restrictions.

Living in an apartment or having limited outdoor space doesn’t mean you have to give up on HF operations. This Balcony antenna offers several compelling advantages for the space-challenged ham operator. Its lightweight fiberglass construction makes it easy to deploy and take down, perfect for temporary installations or portable operations. The antenna can be mounted on a balcony, deployed in a park, or set up during field day events with minimal effort.

What makes this design particularly attractive is its simplicity. Unlike more complex antenna systems requiring extensive hardware and permanent mounting solutions, the fishing pole antenna uses readily available materials and can be assembled with basic tools. The wire elements are supported by an inexpensive telescoping fishing pole, which provides the necessary height and structural support without the weight and complexity of traditional antenna supports.

RW4HFN Balcony Antenna for the 20-Meter Band

Low-Loss Feedline on a Budget: Building 450 to 600 Ohm DIY Ladder Line from Common Materials

DIY Ladder Line for the HF Ham A complete technical guide to building, routing, and using open-wire balanced feedline at your station

Ladder line is a type of feedline made of two parallel wires held apart by small spacers at regular intervals. When you look at it from the side it looks exactly like a ladder — hence the name. The spacers keep the wires a fixed distance apart all the way from the antenna down to your radio room.

Unlike coax cable, which has a center conductor buried inside solid plastic and covered by a metal braid, ladder line is open to the air. This is not a flaw. It is actually its biggest strength. Air is one of the best insulators there is, and it does not eat up your signal the way solid plastic does.

The two wires carry equal and opposite signals. Because they are close together and balanced, the fields from each wire mostly cancel each other out. Very little energy radiates from the feedline itself. This means nearly all your transmitter power reaches the antenna, where it belongs.

Low-Loss Feedline on a Budget: Building 450 to 600 Ohm DIY Ladder Line from Common Materials

Simple High-Gain collinear antenna using coaxial cable

Among the many antenna designs available to amateur radio operators, the coaxial collinear antenna stands out for its rare combination of simplicity, low cost, and excellent performance. Built almost entirely from ordinary coaxial cable, this antenna is capable of producing real gain over a standard quarter-wave vertical while maintaining an omnidirectional radiation pattern that is ideal for local and regional VHF and UHF communication.

The antenna shown in the below attached diagram is a classic example of a vertically stacked coaxial collinear design. Variations of this antenna have been built and refined by radio amateurs around the world for decades, and many commercial base-station antennas use the same underlying principle, hidden inside fiberglass radomes. What makes this design especially attractive is that it requires no traps, coils, or complex matching networks. When built carefully, it works “right the first time” and delivers consistent results.

Simple High-Gain collinear antenna using coaxial cable

3 x 5/8 Collinear antenna for 435 MHz UHF Band

For UHF repeater systems operating around 435 MHz, antenna efficiency and gain are critical. Simple vertical antennas often do not provide sufficient performance, especially when wide coverage and reliable signal strength are required. To address this need, a UHF collinear antenna design adapted from the well-known Diamond BC-200 has been developed and documented by Kostadin Evstatiev (LZ1DJ).This 3 x 5/8 Collinea antenna is intended specifically for the 420–440 MHz band and provides high gain without requiring post-installation tuning when constructed accurately.

3 x 5/8 Collinear antenna for 435 MHz UHF Band