POTA Field Safety

What this module is

This covers safety for portable operating — activating a park, working from a picnic table, hanging wire in trees. It does not repeat the general RF and electrical safety you studied for your license exam. That content lives in Learn. What follows is what changes when you operate in a public place, around strangers, away from your own shack. HamCompass explains. POTA decides. Where a rule belongs to the program or to a park agency, we link you to the official source rather than paraphrasing it.

Why this one is different

Most field hazards give you warning and a second chance. Heat builds slowly. Storms announce themselves. A tick bite is treatable. Contact between an antenna and an energized line does not work that way. It is instant, it is usually fatal, and it happens to experienced operators who have done the same setup a hundred times. Among fatal amateur antenna accidents, power line contact is the leading cause — roughly matched only by falls from towers, which portable operators don't do. So for POTA and portable work, this is the antenna hazard. Operators are killed this way nearly every year, and the cases share one pattern: a mast or wire got away from someone during setup or takedown. A Florida family died when the pole they were raising touched a 13,000-volt line. In July 2025 an operator was killed when a vertical he was handling contacted overhead lines. It is also completely preventable. It is prevented entirely at the moment you choose where to stand — not by care during setup, and not by skill.

Further viewing: Ham Radio Prep covers this hazard, including a real contact incident.

The rules that matter

• Look up before you unpack. Not after. Scan the full arc your mast or wire could travel through.
• Assume every line is energized, at unknown voltage, and that insulation means nothing. Weathered insulation on distribution lines does not protect you.
• Measure in falls, not in feet. The question is not how far away the line is — it is whether the mast reaches it when it tips over.
• Carbon fiber and aluminum masts conduct. So does wet fiberglass. So does a wet throw line.
• Throw lines go wrong. A weighted bag that sails past the branch you aimed at travels a long way.
• Never try to free a snagged antenna from a line yourself. Not with a stick, not with a rope. Call the utility.
• If a mast contacts a line while you are holding it, let go and get clear — do not try to pull it back.

Minimum clearance (OSHA 1910.333(c)(3))

Site selection is the highest-leverage safety decision you make all day. Nearly every hazard in this module is either eliminated or created by where you decide to set up — and unlike everything else, it costs you nothing to get right. The framework below generalizes to any park. Learn the reasoning and you won't need a list.

Where not to set up

Wildlife Management Areas and hunting season

A large share of POTA entities are Wildlife Management Areas, and this is the safety topic nobody writes about. Activating a WMA during firearms season means sitting still, for hours, in brush, often in drab clothing, frequently off-trail, near a thin wire. That is a genuinely dangerous combination and most activators never think about it. Check the WMA calendar before you pick the park, not the morning you leave. Season dates vary by species, by weapon type, and by individual WMA — two neighboring areas can have different dates. Your state wildlife agency publishes them.

If you activate a WMA in season

• Wear blaze orange — a vest and a hat, not just one
• Set up near the parking area or in an open, visible spot rather than in cover
• Skip the camouflage pack and drab clothing for the day
• Make noise on approach; don't move quietly through brush
• Consider simply picking a different park that week — there are plenty

This is the rule most portable operators get wrong, and it is specific to operating in public. The FCC removed the old power-based categorical exemption for amateur stations. Every station now requires an RF exposure evaluation — there is no longer a wattage below which you can skip it.

What this means in practice

• Distance is the whole game. Doubling separation cuts exposure dramatically — moving the feedpoint is nearly always easier than reducing power.
• Keep the high-voltage end of a wire antenna up and away from where people walk. On an end-fed, that's the far end.
• A vertical with radials at ankle height beside a picnic table is the classic portable exposure problem.
• Duty cycle counts. FT8 and long CW runs expose far more than casual SSB with pauses.
• Run your own numbers rather than trusting a rule of thumb — the answer depends on band, power, duty cycle, and antenna.

Run your evaluation

The ARRL RF exposure calculator handles the math for common amateur setups. Do this once for each portable configuration you use, and keep the result — the evaluation is required to exist, not to be filed anywhere.

Lightning

You are outdoors, often in the open, holding or standing beside a tall conductor. Treat lightning as an immediate stop condition, not a judgment call. Current National Weather Service guidance is simply: when thunder roars, go indoors. If you can hear thunder at all, you are within striking distance. Wait 30 minutes after the last thunder before going back out. Note that the older 30/30 rule — counting seconds between flash and bang — is no longer promoted by NOAA. Any audible thunder means shelter now.

Shelter, ranked

• A substantial enclosed building — best
• A hard-topped vehicle with the windows up — good; it's the metal shell, not the tires
• A picnic pavilion, dugout, or open shelter — no. These offer no protection
• Under a tree — actively dangerous
• Disconnect and lower antennas before the storm arrives, not while it's overhead
• Storms build fast in summer afternoons. Check the radar before you leave and again mid-activation

Heat

• Sitting still in heat is deceptive — you're not exerting, so you don't notice the load
• Bring more water than you think you need, and actually drink it on a schedule
• Shade first, then signal. A shaded operating position beats a marginally better takeoff angle
• Know the difference: heat exhaustion means cool down and rehydrate now; hot dry skin, confusion, or no sweating is heat stroke and is a 911 call
• Your radio has thermal limits too — a black case in direct sun will fold before you do

Ticks and insects

• Permethrin on clothing, DEET or picaridin on skin — the combination works far better than either alone
• Check thoroughly when you get home, including hairline, waistband, and behind the knees
• In the Southeast, be aware of alpha-gal syndrome — a lone star tick bite can cause a lasting red-meat allergy
• Save the tick if you're bitten, and note the date
• Yellowjackets nest in the ground and you will find them by stepping on them. Know if you carry an EpiPen

Snakes and plants

• Look before you reach — under logs, into brush, where your throw line landed
• Most bites happen when someone tries to handle or kill the snake. Back away instead
• Learn poison ivy properly. 'Leaves of three' also describes several harmless plants, and misidentifying it both ways causes problems
• In the Southeast, assume any body of fresh water may hold alligators. Don't set up at the water's edge and don't let a dog swim

LiFePO4 and lithium packs

• Fuse at the battery, not just at the radio. An unfused positive lead is the actual fire risk
• A shorted lithium pack delivers enormous current — a dropped wrench across the terminals will weld itself
• Never charge a lithium pack below freezing. It causes permanent internal damage and can lead to failure later
• Inspect for swelling, heat, or damage before every trip. A puffed pack is done — retire it
• Don't charge unattended in a closed vehicle in summer heat
• Cover terminals in transit. Loose gear in a pack finds them

Generators and vehicles

• Generator exhaust is carbon monoxide — never near a tent, vehicle interior, or enclosed shelter
• Running your engine to top off the battery: check what's downwind and whether the park permits idling
• Keep fuel away from the operating position

Someone will eventually call the police on you. A person with wires in a tree, a mast, and radio equipment looks like something to a passerby who has no frame of reference for what you're doing. This is normal, it happens to most active operators, and it goes fine as long as you handle it well.

When a ranger or officer approaches

• Keep your hands visible and stand up slowly. They don't know what the equipment is
• Lead with the plain-English version: 'I'm a licensed amateur radio operator doing a park activation — it's a hobby, like birdwatching with radios'
• Carry your license, physically or on your phone
• Know the park's rules before you arrive so you can answer with specifics
• If they ask you to shut down, shut down. Argue about it later through the right channel, never on the spot
• Be friendly. You're setting the terms for the next operator who activates this park

Operating alone

• Tell someone the park, your rough position, and when you expect to be back
• Check the cell coverage before you commit to a remote spot
• A satellite messenger is worth it if you activate remote parks regularly
• Spotting yourself creates a public record that you're at that park — a real, if accidental, safety net
• Park at a trailhead or lot rather than on a soft shoulder you may not get out of

Official sources

Accurate as of July 2026. Regulations, park rules, and season dates change — verify anything you rely on against the official source linked above. HamCompass explains the rules; POTA and the governing park agency decide them.