Building a DIY Satellite Antenna
Complete guides for building cost-effective satellite antennas.
1. VHF Turnstile Antenna (137 MHz - NOAA Weather Satellites)
Cost: ~$15-25
Difficulty: Easy
Performance: Excellent for NOAA APT reception
Materials Needed
- 4× 50cm lengths of 3mm solid copper wire
- 1× SO-239 (UHF) chassis mount connector
- 1× 50cm length of 20mm PVC pipe
- Coax cable (RG-58 or better)
- Solder and soldering iron
- Electrical tape or heat shrink
- Mounting hardware
Construction Steps
- Cut Elements:
- Each dipole element: 53.4 cm (quarter wavelength at 137 MHz)
- Cut 4 pieces of copper wire
- Prepare PVC Mast:
- Drill hole for SO-239 connector at center
- Drill 4 holes at 90° intervals for dipole elements
- Assemble Dipoles:
- Create two dipoles perpendicular to each other
- Phase one dipole 90° ahead using coax delay line
- Connect Feed:
- Solder dipoles to SO-239 center and shield
- Waterproof all connections
Detailed Guide
2. QFH Antenna (137 MHz - NOAA/METEOR)
Cost: ~$25-40
Difficulty: Moderate
Performance: Superior circular polarization, best for LEO
Materials Needed
- 6 meters of 12 AWG copper wire
- 2× 60cm lengths of 20mm PVC pipe
- 1× 40cm length of 25mm PVC pipe (boom)
- 1× SO-239 connector
- 1× 1:1 balun or ferrite choke
- PVC T-joints and caps
- Coax cable
- Cable ties
Construction Steps
- Calculate Dimensions for 137.5 MHz:
- Small loop circumference: 216.8 cm
- Large loop circumference: 217.6 cm
- Height: 54.4 cm
- Build Support Structure:
- Use PVC pipes to create vertical supports
- Space them at calculated loop diameter
- Form Loops:
- Bend copper wire into helical loops
- Small loop: 2 turns
- Large loop: 2 turns, slightly larger diameter
- Phase and Connect:
- Connect loops with 90° phase difference
- Use balun to match impedance
Detailed Guides
3. UHF Yagi Antenna (435-438 MHz - CubeSats)
Cost: ~$30-50
Difficulty: Moderate
Performance: High gain, directional (requires tracking)
Materials Needed
- 1× 1m length of 20mm PVC pipe (boom)
- 5-7× 6mm aluminum rods (elements)
- 1× SO-239 connector
- Coax cable
- U-bolts for mounting
- Hose clamps
Construction Steps
- Calculate Element Lengths (435 MHz):
- Reflector: 35.8 cm
- Driven element: 32.6 cm (dipole)
- Director 1: 31.2 cm
- Director 2: 30.5 cm
- Director 3: 30.0 cm
- Element Spacing:
- Reflector to driven: 16.5 cm
- Driven to director 1: 15.0 cm
- Directors spaced: 12-15 cm apart
- Assembly:
- Drill holes in PVC boom for elements
- Insert and secure elements
- Connect driven element to SO-239
- Isolate driven element from boom
- Tuning:
- Use antenna analyzer or SWR meter
- Adjust element lengths for minimum SWR
Detailed Guide
4. Helical Antenna (2.4 GHz - S-band Satellites)
Cost: ~$40-60
Difficulty: Advanced
Performance: Circular polarization, high gain
Materials Needed
- 3 meters of 2mm copper wire
- 1× 40cm length of 40mm PVC pipe
- 1× 15cm diameter ground plane (aluminum sheet)
- N-type connector
- Coax cable
Construction Steps
- Calculate Helix Dimensions (2.4 GHz):
- Circumference: 12.5 cm (1λ)
- Pitch: 3.125 cm (0.25λ)
- Number of turns: 10-12
- Diameter: 4 cm
- Wind Helix:
- Mark PVC pipe with spiral guide
- Wrap copper wire following marks
- Secure with epoxy or hot glue
- Ground Plane:
- Cut circular reflector
- Mount at base of helix
- Connect N-connector
- Feed Point:
- Connect helix start to center conductor
- Ground plane to shield
Detailed Guide
5. Eggbeater Antenna (145/435 MHz - Dual-band LEO)
Cost: ~$35-50
Difficulty: Moderate-Advanced
Performance: Dual-band, circular polarization, omnidirectional
Materials Needed
- Copper wire: 12 AWG
- PVC pipe: 20mm for structure
- 2× SO-239 connectors (VHF/UHF)
- Coax cable
- 2× Baluns
- PVC fittings
Construction Steps
- VHF Elements (145 MHz):
- Loop circumference: 207 cm
- Height: 51.8 cm
- UHF Elements (435 MHz):
- Loop circumference: 69 cm
- Height: 17.3 cm
- Nested Construction:
- Mount UHF loops inside VHF loops
- Use separate feed points
- Maintain 90° phase offset for each band
- Tuning:
- Test each band independently
- Adjust loop sizes for resonance
Detailed Guide
Antenna Testing and Tuning
Equipment Needed
- NanoVNA or antenna analyzer (~$50)
- SWR meter
- RTL-SDR for signal strength
Testing Procedure
- SWR Measurement:
- Connect antenna to analyzer
- Sweep frequency band
- Target SWR < 2:1 at center frequency
- Pattern Testing:
- Use known satellite pass
- Compare signal strength vs. time
- Verify omnidirectional or directional pattern
- Tuning:
- Adjust element lengths for minimum SWR
- Trim in small increments (1-2mm)
- Retest after each adjustment
Antenna Mounting
Weatherproofing
- Seal all connections with self-amalgamating tape
- Apply liquid electrical tape or silicone
- Use UV-resistant cable ties
- Protect connectors with boots
Mounting Hardware
- Use antenna masts or PVC pipes
- Guy wires for tall installations
- Ground plane if needed
- Lightning protection for permanent installations
Positioning
- Mount as high as practical
- Clear line of sight to horizon
- Away from metal structures (>2m)
- Vertical orientation for LEO satellites
| Antenna |
Frequency |
Gain |
Pattern |
Difficulty |
Cost |
| Dipole |
VHF/UHF |
2 dBi |
Omni |
Easy |
$10 |
| Turnstile |
137 MHz |
3 dBi |
Omni |
Easy |
$20 |
| QFH |
137 MHz |
4 dBi |
Omni (CP) |
Moderate |
$35 |
| Yagi |
UHF |
10+ dBi |
Directional |
Moderate |
$45 |
| Eggbeater |
Dual-band |
5 dBi |
Omni (CP) |
Advanced |
$50 |
| Helix |
S-band |
12+ dBi |
Directional |
Advanced |
$60 |
CP = Circular Polarization
Recommended First Antenna
For beginners: Start with a VHF Turnstile or QFH
- Easy to build
- Great for NOAA weather satellites
- Omnidirectional (no tracking needed)
- Forgiving design
For intermediate: Add a UHF Yagi
- Track satellites for better signals
- Decode CubeSat telemetry
- Learn about directional antennas
Safety Notes
- Never work on antennas during storms
- Keep antennas away from power lines
- Ground metallic structures
- Use proper RF safety practices
- Follow local building codes
Resources
Online Calculators
Communities
- r/amateurradio
- r/RTLSDR
- SatNOGS Forums
- AMSAT Mailing Lists
Suppliers
- Copper Wire: Local hardware stores
- PVC: Home Depot, Lowe’s
- Connectors: DX Engineering, Ham Radio Outlet
- Coax: Times Microwave, Belden
Build once, receive forever!