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Cass Brennan Started Making Copper Antennas for Her Own Garden. Now She Can’t Stop.
Cass Brennan spent eighteen years as an electrical engineer. In 2019 she started a kitchen garden in Taos. In 2021 she learned about electroculture — the practice of using coiled copper wire to interact with the electromagnetic field around plant root systems. She built her first antenna. By the end of that summer, she wasn’t sure she believed in it. By the end of the next summer, she couldn’t stop making them.
“I went in as a skeptic with a background in electrical engineering,” she says, pulling a length of copper wire off the spool. “I thought: I’ll test this properly and then I’ll know. What I got was a result I couldn’t dismiss. Which is worse than a clear no, in some ways, because then you have to keep looking.”
Her test was simple: matched raised beds, same soil prep, same seeds, same irrigation schedule. Half the beds got antennas. Half didn’t. At the end of the season she compared yield by weight. The antenna beds produced more in every category. Not a lot more in some. A lot more in others. The tomato difference was the one she keeps coming back to.
She ran the test again the next year. And the year after. The results have been consistent enough that she’s stopped arguing about the mechanism — she doesn’t fully understand it, she says, even with the engineering background — and started thinking about the antennas as tools. “A gardener doesn’t need to understand soil biology to know that compost works,” she says. “I know these work. I use them in every bed.”
The Spiral That Took Forty Versions
Cass wound forty antennas before she settled on the current spiral pitch. The pitch — the angle of the wire as it travels up the wooden stake — is the variable she spent the most time on. Too tight and the electromagnetic interaction radius narrows. Too loose and the coil loses its coherence. “I can tell you what ratio I landed on,” she says. “I can’t fully tell you why it’s right. I can tell you the yield data is better at this pitch than any other I tested.”
“I went in as a skeptic with a background in electrical engineering. The mechanism is still not fully clear to me. What is clear is the yield difference. Two seasons of data, consistently better with antennas than without.”
The copper she uses is pure, not alloy. The gauge is heavier than what you find in craft store copper wire — the weight gives each antenna structural integrity so it doesn’t unwind over a season of weather. She sources it from the same supplier she’s used since the first batch. “The quality of the copper matters more than I expected,” she says. “I tried three suppliers. The results varied.”
The Garden That Changed the Practice
Cass’s Taos garden is about 800 square feet. She runs antennas in every raised bed — 14 antennas total, spaced according to a placement guide she developed over two seasons of testing. The guide comes with every order. “Spacing matters,” she says. “One antenna in a 4x8 bed is not the same as two. The radius is real.”
She offers three pack sizes: a single antenna to start, a set of three for a medium bed, and a homestead pack of twelve for serious gardens. The single is for the person who wants to test before committing — which is how she started, and she respects the instinct. The three-pack is what she recommends for a standard raised bed. The twelve-pack is for the person who’s already convinced.
The wooden handles are sealed and weather-treated. She tested handle materials for a season before settling on the current wood and sealant combination. The handles in her own garden are now two seasons old and show no rot, no weathering, no loss of structural integrity. She expects them to last five to seven seasons with normal use.
What Makes This Antenna Different
Cass sources pure copper at a heavier gauge than what you find in hobby stores. The purity matters for conductivity. The gauge matters for structural integrity — a lighter wire unwinds over a season of weather and loses the spiral pitch that makes the antenna work. These hold their shape.
Cass wound forty antennas at different pitches before she settled on this one. The pitch affects the electromagnetic interaction radius. She has yield data from two seasons at this pitch and at all the others she tested. This pitch is the one that produced the best results, consistently.
The handle material and sealant combination was tested in Cass’s own garden for a full season before she sold a single antenna. Her own antennas are now two seasons old and show no degradation. She expects five to seven seasons from the wood under normal garden conditions.
One antenna in a raised bed is not the same as two placed correctly. Cass developed a spacing guide over two seasons of testing. It comes with every order. The guide covers bed size, plant type, and placement relative to the bed edges.
A single antenna to test. A three-pack for a standard raised bed. A twelve-pack for the person who’s already convinced or has a large garden. Cass started with one antenna in one bed. She now runs fourteen in every bed she has.
What She Still Doesn’t Know
Cass is clear about what she knows and what she doesn’t. She knows the yield data from her own garden over three seasons. She knows the results from customers who have sent her their own plots and numbers. She doesn’t know the mechanism at a level that satisfies the engineer in her. “That’s uncomfortable,” she says. “But it’s honest.”
She keeps running the test. This season she’s added a new bed type to the comparison — clay-heavy soil, which behaves differently from the sandy Taos dirt she’s been working in. The data will take another season to read. She’ll report it when she has it.
Pure copper, spiral-wound by hand to the pitch she spent two years finding. A placement guide she built from real garden data. Three pack sizes, from a single to a homestead twelve. If you’ve been curious about electroculture and wanted to try it with something made by a person who takes it seriously — this is the starting point.
Hand-wound in Taos — stock varies with Cass’s winding schedule
Choose your pack below. Ships from New Mexico while in stock. Free shipping over $75.
See Packs & AvailabilitySingle · Garden Set (3) · Homestead Pack (12)
What People Are Saying
★★★★★
“I put three of these in my raised tomato bed mid-June and by August the yield difference from my control bed was obvious. More fruit, less blossom drop. I can’t explain the mechanism but I can explain the harvest. I’m ordering the 12-pack for next season.”
★★★★★
“Skeptic turned believer. I tried one antenna in a half-dead pepper plant that I was about to pull. Three weeks later it was putting out new growth. I ran it another four weeks and the plant finished the season. I can’t explain it but I can’t dismiss it either. Now I have nine antennas in my garden.”
★★★★★
“My squash beds with antennas produced noticeably more than the beds without. Same seeds, same soil prep, same water schedule. I’ve been gardening for fifteen years and this is the most curious result I’ve ever gotten. Cass’s placement guide was helpful. I’ve recommended these to everyone in my garden club.”
A Few Questions Before You Choose
How many antennas do I need for my garden?
Cass’s placement guide — which ships with every order — covers this in detail. The short answer: one antenna covers roughly a 2x4 foot radius from its placement point. A standard 4x8 raised bed benefits from two antennas, placed at one-third intervals from each end. A larger bed or a denser planting benefits from more. The three-pack is her recommendation for a standard raised bed.
Does it matter where I place them?
Yes. Cass tested placement variables across two seasons and found that placement relative to the bed edges and to dense root zones affects the outcome. The placement guide she developed covers bed shape, plant type, and spacing. It’s the result of real-garden testing, not a general guide written from theory.
How long will they last in a garden?
Cass’s own antennas are three seasons old. The copper is unchanged — copper doesn’t corrode in garden conditions, it patinas, which doesn’t affect function. The sealed wood handles show no degradation after two full seasons of New Mexico weather. She expects five to seven seasons from a normal garden installation.
Pure copper · hand-wound · includes placement guide
See what’s in stock from Cass’s current batch.
See Packs & AvailabilityShips from Taos while in stock.