How you can install a complete Budget Class 160 - 6m Ham Radio station in a small garden

VIDEO

A full HF station from 160 metres up to 6 metres is achievable from a modest garden without expensive aerials or kilowatt transmitters. The key is a simple, well-thought-out wire antenna, a small matching unit, light coax and a transceiver with a capable antenna tuning unit. With basic components and a little patience, you can work everything from local ground-wave contacts on 160 m to DX on the higher bands.

Think of a typical suburban plot: roughly 45 ft long by 25 ft wide. You will rarely be able to run a long antenna in a straight line in that space, but you can bend a wire, make right-angle turns, form an inverted V or an inverted L. A bent wire is far better than a very short straight aerial. The radiation pattern of such a wire is broadly omnidirectional, and even low heights work — 12 to 15 ft is perfectly usable.

Height affects performance, but a low wire can be an advantage on the lower bands because it promotes near-vertical incidence radiation, great for short-skip and local work. On 160 m and 80 m, a low, long wire still performs well for regional contacts and ground-wave communication.

A single wire of around 71 ft is a practical, multi-band solution for a small garden. The 71 ft length is not random by chance — it provides usable reactances across the HF spectrum and, when combined with the right matching, covers 160 m through 6 m.

• Run the wire down the garden, bending at right angles if necessary to fit the space.
• Consider an inverted V or inverted L to keep the centre higher and reduce strain at supports.
• Terminate the far end safely and keep it away from windows or lines where people walk.

To get a usable match from a long random wire you need a simple matching device at the feed point. The recommended solution is a 9:1 unun at the start of the run down the garden.

• Connect the wire to the unun's hot side and the coax to the unun's output.
• Use light, manageable coax such as RG58. It has slightly higher loss than thicker cables, but it is lighter and puts less strain on the support point.
• Install a line isolator (a clamp-on ferrite core or small choke) around the coax just before it enters the transceiver to prevent unwanted feedline currents.

You do not need a dedicated earth connection on the unun unless specified by the model. If there is an earth terminal and you do not have a suitable counterpoise, leaving it unused is often acceptable when using a 9:1 with vertical or sloping wires.

A transceiver with a robust internal antenna tuning unit (ATU) makes life much easier with random wires. A well-designed internal ATU will accept higher VSWRs and still deliver the set output power to the antenna system by matching the transceiver output to the feedline.

If the ATU achieves a match, the transceiver will pass the full power into the coax and antenna. The only remaining loss is the extra loss caused by the mismatch 
and the inherent loss of the coax, both of which are small for typical lengths used in a garden installation.

High VSWR numbers can look alarming, but what matters is how much additional loss that VSWR actually causes. Measurements taken with a 71 ft wire and a 9:1 unun over a 50 ft run of RG58 show that:

• In many cases the additional loss from VSWR was only a fraction of a decibel on the lower bands.
• On most bands from 160 m through 10 m the VSWR loss was less than 1 dB.
• 1 dB is barely noticeable; it is roughly the smallest change in strength the ear can detect. So losses below 1 dB are effectively negligible in day-to-day operation.

Remember that coax itself has an inherent loss even at 1:1 VSWR. The important question is the incremental loss due to the mismatch. For garden-length coax runs and a robust ATU, that incremental loss is small and should not deter you.

• 71 ft antenna wire (insulated copper is fine)
• 9:1 unun at the feed point
• RG58 coax (typical garden run: 25 to 50 ft)
• Clamp-on ferrite cores or a small coax choke as a line isolator
• Supports: small poles, gutter hooks, garden post or tree branch
• Transceiver with capable internal ATU

With a properly tuned 71 ft wire and a matching unun you can:

• Operate 160 m to 6 m on a single antenna installation.
• Run full legal power from the transceiver because the internal ATU will present a matched load.
• Enjoy local ground-wave contacts on 160 m during evenings and near-term DX when conditions allow.

"You don't need lots of power. You don't need massive great aerials." 

That encapsulates the approach: a simple, well-matched wire, modest power and patience will yield satisfying results. Many operators use low power, homemade rigs and simple wires and still make excellent contacts. It is often more rewarding to work stations using modest setups than it is to rely on high power and large arrays.

• If the ATU struggles to find a match, try slightly adjusting wire length or changing the shape (raise the apex of an inverted V, lower or raise sections).
• Keep coax runs as short as practical to minimise inherent coax loss.
• Secure the feed point carefully. A struggling support causes noise and failures. Lighter coax reduces pull on the feed point.
• Try different times of day. Lower bands often work best in the evening for regional contacts; higher bands open at different times for DX.

A complete, budget-friendly HF station covering 160 m through 6 m is realistic from a small garden. Use a 71 ft wire, a 9:1 unun at the feed point, RG58 coax, a ferrite line isolator and a transceiver with a good internal ATU. You will likely see VSWR values that look high on paper, but the actual power loss is minimal. With patience and a willingness to experiment with layout and time of operation, this simple setup will get you on all the major HF bands and provide plenty of fun on the air.

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