700 MHz – 3.8 GHz
Cellular 4G/5G
Tower + device downlink
38 – 24 dB
Nullhaven is a travel-ready bed shelter that fuses a fine-mesh mosquito net with a lightweight conductive shielding textile. One suspension point, four ground stakes, thirty seconds from stuff sack to sleep — for digital nomads, frequent travelers, campers, and anyone whose sleep hygiene refuses to live at home.
How it works
Nullhaven is two concentric envelopes hung from the same apex line. The outer shell is a tough ripstop rainfly. The inner envelope is a hybrid textile: a highly conductive silver-coated or Swiss Shield–style weave, interlaced with a breathable insect mesh. Bug protection and RF attenuation are baked into a single layer instead of stacked into something two-people-can-barely-lift.
Measured, not hyped
The shielding textile is characterized at the RF bands you actually sleep under. Numbers below are representative of prototypes in our lab — final production units ship with a measured per-band attenuation sheet, and we publish the full report rather than a single combined percentage. Cautions from bodies like the FCC and WHO on EMF science stand; we make no medical claims.
700 MHz – 3.8 GHz
Cellular 4G/5G
Tower + device downlink
2.4 / 5 GHz
Wi-Fi
Router, hotspots, mesh
2.4 GHz
Bluetooth
Wearables, peripherals
1.1 – 1.6 GHz
GPS / GNSS
Location services
Packability
A featherweight pop-up frame, a ripstop outer skin, and a single-pole geometry make setup a one-person, thirty-second job. Packs into a stuff sack sized for a 30-litre backpack — or your carry-on, if you travel light.
Tree branch, beam, balcony hook, or the included ridgeline cord strung between two anchors.
Four ground stakes tension the ripstop floor into a taut, bug-sealed rectangle.
Slide along the ridgeline until the canopy hangs clear of your face. Sleep.
Specifications
| Term | Value |
|---|---|
| Packed size | ~22 × 14 × 14 cm |
| Packed weight | ~640 g (1.4 lb) |
| Set-up height | ~210 cm at apex |
| Sleeping footprint | Single, ~200 × 90 cm |
| Suspension | 1 point + 4 ground stakes |
| Outer skin | 20D ripstop nylon, DWR-coated |
| Shielding layer | Silver-coated Swiss Shield–style weave |
| Insect mesh | 1200-hole polyester, EN 13561 mosquito barrier |
| Vented panels | 4 mesh windows, top + sides |
| Pack & carry | Stuff sack, fits a 30 L backpack |
FAQ
Direct answers, no hedging. If yours isn’t here, write to nullhaven@polsia.app.
Get one
Field-prototype units are finishing their second test cycle now. Reserve a pre-order slot, ask for the attenuation report, or pitch a use case we haven’t thought of.