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☀ Solar
SFI 128
SN 73
A 6
K 1 Quiet
X-Ray C2.2
Wind 403.6 km/s
Aurora 2
Updated 23:00 UTC HamQSL · N0NBH
Day 80/40m Fair 30/20m Good 17/15m Good 12/10m Fair
Night 80/40m Good 30/20m Good 17/15m Good 12/10m Poor

Callsign Lookup
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Vanity Call Signs Available
Enter filters above and click Search.
ⓘ Callsign lookups are in real time via the FCC database. Vanity callsign availability is refreshed daily at 6:00 AM CST. The vanity search may be unavailable for a few minutes during this update.
Live DX spots
Live DX Spots — 70cm via PSKReporter · scroll or pinch to zoom
Band
Mode
Time
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MHz DX Spotter Info
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Ready — select a band to fetch live spots

Antenna Components & Matching Devices

The hardware that connects your antenna to your radio — baluns, ununs, chokes, antenna tuners, RF connectors, variable capacitors, and more. Every device referenced throughout the antenna build guides above gets its own complete, step-by-step build guide here: theory, materials list, construction steps, troubleshooting, and FAQ. 36 guides across 14 categories.

Baluns
1:1 Current Balun / Choke 4:1 Current Balun 6:1 Balun Voltage vs Current Balun — Which One Do You Need
Ununs
9:1 Unun for Random Wire Antennas 49:1 Unun for End-Fed Half-Wave Antennas 64:1 Unun — and When to Choose It Over 49:1
Counterpoise
Counterpoise Design for End-Fed Antennas
Yagi / Beam Matching Methods
Gamma Match for Yagi Antennas Hairpin (Beta) Match T-Match Delta Match Omega Match
General / Vertical Matching Networks
L-Network Matching Quarter-Wave Transformer and Stub Matching Series Match
Traps
Coil-and-Capacitor Trap Construction Coax-Wound Trap Construction
Antenna Tuners
L-Network Antenna Tuner T-Network Antenna Tuner Pi-Network Antenna Tuner Z-Match / Link-Coupled Tuner Manual vs Automatic Antenna Tuners — Comparison
Line Isolation / Choke Placement
Line Isolator (Shack-Entry Choke) Common-Mode Choke Placement Guide
Variable Capacitors
Variable Capacitor Selection for Magnetic Loops DIY / Homebrew Variable Capacitor Construction Split-Stator vs Butterfly vs Air Variable — Comparison
Toroid / Core Reference
Toroid and Ferrite Core Selection Guide
RF Connectors
PL-259 / SO-239 Connector Installation BNC Connector Installation N-Connector Installation Choosing the Right RF Connector
Phasing / Arrays
Phasing Harness / Power Divider for Stacked Arrays
Magnetic Loop Coupling
Coupling Loop Design for Magnetic Loop Antennas
Test Equipment
Homebrew SWR / Directional Wattmeter (Bruene Bridge)
← Build Guides  ·  Ham Radio Antennas  ·  HamRadioBase.com

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