What grid square is Sao Paulo?

GG66 is the live DXRadar reference square for Sao Paulo. The exact portable or home QTH may vary within the square, but this page tracks the center of GG66 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 GG66 right now?

GG66 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 GG66 Band Conditions — Sao Paulo

Localized HF conditions for Maidenhead locator GG66. Coordinating at -23.50°, -47.00°. Updated with real-time telemetry from NOAA and DX cluster reports.

GG66 conditions are POOR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 104.

Regional Radar

SFI

104

K-Index

0 Kp

Center Coords

-23.5, -47.0

Local Phase

Night

Grayline window

Sunrise 09:00 UTC

Sunset 21:04 UTC from GG66

From Sao Paulo, work the 09:00 UTC and 21:04 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses GG66.

Best band now

10m

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

Closest operating hub

Sao Paulo

This square sits in South America 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: 09:00 UTC / 21:04 UTC
Best high band: 10m
Nearest city: Sao Paulo

● Local Band Quality Scorings

Use this local score for GG66, 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 GG66 — Sao Paulo

Great-circle distance, short-path beam heading, the bands most likely open right now from GG66 to each DX region at SFI 104 / Kp 0, 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
Southern Africa	4,521 mi	109°	40m, 20m, 80m	Open now
North America	5,431 mi	322°	40m, 20m, 80m	Open now
Europe	6,157 mi	33°	40m, 20m, 80m	Open now
Oceania	8,572 mi	198°	10m, 15m, 20m	Open now
South Asia	8,953 mi	80°	40m, 20m, 80m	Open now
East Asia / Japan	11,523 mi	342°	10m, 15m, 20m	Open now

● Band-by-Time Plan for GG66

A planning heuristic for the local day at GG66, built from sunrise 09:00 UTC, sunset 21:04 UTC, SFI 104, and Kp 0. Not a measurement — a starting point for where to listen as the day turns.

Dawn grayline

around 09:00 UTC

40m · 30m · 20m

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

Morning

after 09:00 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 21:04 UTC

20m · 40m

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

Night

after 21:04 UTC

40m · 80m

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

Recent local activity

Spots touching GG66 and the adjacent squares

These are the newest 10m, 15m, and 20m reports where one side of the path sits in GG66, GG67, GG65, GG76, GG56. This gives the page unique, local context instead of a generic solar snapshot.

No fresh PSKReporter paths are cached for the immediate GG66 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 GG66, start with 10m POOR, 15m POOR, 20m FAIR and keep 20m available as the safest all-around fallback.

Open contest calendar

Nearby grids