What grid square is the EF04 operating area?

EF04 is the live DXRadar reference square for the EF04 operating area. The exact portable or home QTH may vary within the square, but this page tracks the center of EF04 for planning propagation.

How do I find my grid square?

Use a Maidenhead grid lookup from your GPS coordinates or street address, then compare that grid with the nearby squares linked on this page. A 4-character grid is enough for most HF planning.

What bands are open in EF04 right now?

EF04 is currently rated POOR. The best bands right now are 10m, 20m, 30m, 40m, 60m, with 10m as the main band to watch first.

Grid EF04 Band Conditions

Localized HF conditions for Maidenhead locator EF04. Coordinating at -35.50°, -99.00°. Updated with real-time telemetry from NOAA and DX cluster reports.

EF04 conditions are POOR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 105.

Regional Radar

SFI

105

K-Index

0.33 Kp

Center Coords

-35.5, -99.0

Local Phase

Night

Grayline window

Sunrise 12:26 UTC

Sunset 00:33 UTC from EF04

From the EF04 operating area, work the 12:26 UTC and 00:33 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses EF04.

Best band now

10m

Night operation should keep 20m on watch and move to 40m as the path darkens.

Closest operating hub

the EF04 operating area

This square sits in a mixed-region footprint and is best used as a planning center for portable, field-day, and home-station band decisions.

Latitude zone: mid-latitude
Local phase: Darkness
Aurora exposure: low at this latitude
Grayline: 12:26 UTC / 00:33 UTC
Best high band: 10m
Nearest city: the EF04 operating area

● Local Band Quality Scorings

Use this local score for EF04, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.

10m

POOR

15m

POOR

20m

FAIR

40m

EXCELLENT

80m

EXCELLENT

● Best DX Windows from EF04 — the EF04 operating area

Great-circle distance, short-path beam heading, the bands most likely open right now from EF04 to each DX region at SFI 105 / Kp 0.33, and a current verdict. "Open now" means a suitable band is scoring well on that path; "Try ~HH:MM" points at the next far-end grayline. Band picks and status are a planning heuristic, not a measurement.

Target	Distance	Beam	Bands to try	Status
South America	2,898 mi	71°	10m, 15m, 20m	Open now
North America	5,148 mi	1°	40m, 20m, 80m	Open now
Oceania	6,069 mi	234°	40m, 20m, 80m	Open now
Southern Africa	6,875 mi	132°	10m, 15m, 20m	Open now
Europe	8,842 mi	50°	10m, 15m, 20m	Open now
East Asia / Japan	9,288 mi	288°	40m, 20m, 80m	Open now
South Asia	11,487 mi	168°	10m, 15m, 20m	Open now

● Band-by-Time Plan for EF04

A planning heuristic for the local day at EF04, built from sunrise 12:26 UTC, sunset 00:33 UTC, SFI 105, and Kp 0.33. Not a measurement — a starting point for where to listen as the day turns.

Dawn grayline

around 12:26 UTC

40m · 30m · 20m

Grayline enhancement — low bands reach long distances as the terminator passes.

Morning

after 12:26 UTC

20m · 15m

Modest SFI — 20m is the daytime workhorse here.

Midday

local noon

15m · 20m

20m and 15m carry the daytime load at this SFI.

Dusk grayline

around 00:33 UTC

20m · 40m

Second grayline peak — 20m holds, then hands off to 40m.

Night

after 00:33 UTC

40m · 80m

Low bands own the darkness — 40m for DX, 80m regional.

Recent local activity

Spots touching EF04 and the adjacent squares

These are the newest 10m, 15m, and 20m reports where one side of the path sits in EF04, EF05, EF03, EF14, DF94. This gives the page unique, local context instead of a generic solar snapshot.

No fresh PSKReporter paths are cached for the immediate EF04 footprint right now. That usually means you should widen the search to the nearest regional hubs below or fall back to 20m/40m for the next operating window.

Top DX targets

Where this grid is reaching right now

No outbound targets were strong enough to rank from the current cache. Check back after the next PSKReporter refresh or switch to the regional grids below.

Contest preview

Next major contest outlook

No contest event is currently loaded. For planning from EF04, start with 10m POOR, 15m POOR, 20m FAIR and keep 20m available as the safest all-around fallback.

Open contest calendar

Nearby grids