Shakespeare 6400-R Phase III 4ft VHF Antenna - Compact 3dB Gain

In this review of the Shakespeare 6400-R Phase III VHF antenna, the bottom line is straightforward: this compact 4 ft marine antenna is for boaters who need reliable VHF communications from a small, commercial-grade package. The reviewer found its silver-plated outer conductor, copper inner conductor and stainless steel mounting sleeve combine into a durable unit that performs well aloft on hardtops and T-tops. The integrated Type SO-239 connector inside the sleeve and the suggested Shakespeare 4187-HD ratchet mount make it easy to install and stow, which is the single biggest reason to buy.

Key Features

• Silver-plated outer conductor: improves conductivity and resistance to corrosion for long-term signal stability in a saltwater environment.
• Copper inner conductor: provides a reliable core for consistent VHF transmission and reception across the marine band.
• Stainless steel mounting sleeve: offers a sturdy attachment point that withstands vibration and outdoor exposure on boats.
• Built-in Type SO-239 connector: allows quick mounting and dismounting for stowage without complex coax termination work.
• Compact 4 ft length with 3 dB gain: delivers improved range and performance while remaining small enough for T-tops and hardtops.
• Phase III electronic elements: the commercial-grade internals are positioned with an ethafoam spacer system for consistent performance.

Who It's For

The Shakespeare 6400-R suits owners of center consoles, sportfishing boats and cruisers who need a dependable VHF antenna that does not dominate the profile of the vessel. It is especially useful where mount space is limited or an antenna must be raised on a hardtop or T-top and still be removable for storage.

Boaters who need the absolute maximum range from a tall, multi-section tower antenna or those wanting integrated GPS or cellular functions should consider other models, but for straightforward VHF voice communications and a rugged, easy-to-service design, this antenna fits most needs.

Pros & Cons

Pros

• Durable construction with silver-plated and copper conductors for reliable marine performance.
• Compact 4 ft form factor provides 3 dB gain without excessive height or windage.
• Stainless steel sleeve and internal SO-239 connector make mounting and stowage simple.

Cons

• Does not include a mount; the suggested Shakespeare 4187-HD ratchet mount is sold separately.

Specifications

Brand	Shakespeare
Model	6400-R Phase III
Length	4 ft (1.2 m)
Gain	3 dB (VHF marine band)
Connector	Type SO-239 inside stainless steel sleeve
Mounting	Stainless steel mounting sleeve; suggested mount 4187-HD ratchet
Construction	Silver-plated outer conductor, copper inner conductor, fiberglass radome

Our Verdict

The Shakespeare 6400-R Phase III is a practical choice for boaters who want a compact, commercial-grade VHF antenna that balances durability and performance. With easy mounting, corrosion-resistant materials and a modest 3 dB gain, it is good value for anyone needing dependable VHF communications from a small antenna that can be stowed when required.

Frequently Asked Questions

Is this antenna easy to remove for stowage?
Yes, the internal Type SO-239 connector inside the stainless steel sleeve is designed for quick mounting and dismounting.

What mount is recommended for this antenna?
Shakespeare suggests the Style 4187-HD ratchet mount for secure installation on hardtops and T-tops.

Will this antenna improve VHF range?
The 4 ft design provides about 3 dB gain on the VHF marine band, offering improved range over a basic whip while keeping a compact profile.