Description

Shakespeare Phase III 18 ft VHF Marine Antenna with Ratchet Mount (SHA-6018-R)

When range is non-negotiable, the Shakespeare Phase III 18 ft VHF antenna is the benchmark. Delivering 9 dBd gain from an 18-foot fibreglass radiator, this is the highest-gain antenna in the Phase III recreational and commercial crossover lineup — trusted by offshore sportfishers, large powerboats, and working vessels where every nautical mile of VHF range matters. The integrated ratchet mount allows the antenna to fold down for bridge clearance, covered slips, and trailering without removal.

Key Features

• 9 dBd gain — maximum VHF range for offshore and long-range coastal operations
• 18-foot (5.5 m) fibreglass construction delivers exceptional signal projection
• Integrated ratchet mount folds and locks at multiple angles — no tools required
• Covers the full VHF marine band (156–163 MHz)
• Standard 1–14 UNS thread base for compatibility with most marine antenna mounts
• UV-stabilised fibreglass radome for long-term structural and cosmetic integrity
• Shakespeare Phase III series — the professional’s choice for high-gain marine VHF

Understanding Gain

Each 3 dB increase in antenna gain roughly doubles effective radiated power in the horizontal plane. The 18 ft Phase III’s 9 dBd gain provides dramatically greater range than a standard 3 dBd (4 ft) antenna — critical for offshore fishing, commercial operations, and any application where early contact with coast guard or other vessels can make a real difference.

Ratchet Mount Advantage

At 18 feet, a fixed-mount antenna presents real challenges in marinas and under bridges. The -R ratchet mount allows the antenna to fold down in seconds and lock securely at multiple angles, protecting the antenna and eliminating the need to remove and stow it separately.

Specifications

• SKU: SHA-6018-R
• Brand: Shakespeare
• Series: Phase III
• Length: 18 ft (5.5 m)
• Gain: 9 dBd
• Frequency: 156–163 MHz (VHF Marine Band)
• Mount: Ratchet (foldable), 1–14 UNS thread
• Construction: Fibreglass radome
• Estimated Weight: 3.2 kg

Note: This item is currently out of stock. Inventory tracking is suspended until further notice. Contact us to inquire about availability or lead times.