Antenna Extensions
What Are Antenna Extensions and Why Do They Matter?
Whether you're navigating open water or cruising down the highway in an RV, reliable antenna signal can be the difference between staying connected and going dark. Antenna extensions are mast sections that physically raise your antenna above obstructions — radar arches, bimini tops, lights, and other hardware — to give it a clearer line of sight and maximize signal range. Extensions are used to lift your antenna above obstructions like radar arches, lights, or bimini tops to ensure a clear line of sight for better signal range.
In the marine world, this matters enormously. A VHF radio antenna mounted too low can have its signal blocked by the boat's own superstructure, dramatically reducing effective range. Even a foot or two of additional height can translate into meaningful gains in communication distance, which is critical for safety at sea. Marine VHF antennas support distress calling, marina contact, bridge communication, and boat-to-boat radio use — all of which depend on consistent, uninterrupted signal.
How Antenna Extensions Work
Antenna extensions are essentially rigid mast sections designed to thread between an existing mount and the antenna itself. Most marine antennas use a standard 1" x 14 threaded connection, and extensions follow the same convention, with both male and female threaded ends for easy stacking. Shakespeare antenna extensions feature heavy-duty stainless steel masts with standard 1"–14 thread male and female fittings. Extensions are available in both stainless steel and fiberglass materials — stainless offers maximum durability and corrosion resistance in saltwater environments, while fiberglass extension masts are lightweight and non-conductive, which can be an advantage in certain electrical setups.
One key consideration when adding height to your antenna installation is the trade-off between elevation and cable length. Consider the advantages vs. disadvantages of antenna height compared to signal loss from using a longer cable — a mast can give you fabulous elevation, but often the height isn't worth the signal losses from a longer cable, so it is often better to pick a midway point to strike the best trade-off. For those who trailer their boat or frequently pass under low bridges, choosing a mount with a ratchet adjustment allows you to easily lay the antenna down.
What to Look for When Buying Antenna Extensions
- Material: Stainless steel resists corrosion in harsh saltwater conditions; fiberglass is lightweight and non-conductive.
- Thread Compatibility: Look for standard 1" x 14 threads to ensure compatibility with your existing antenna and mount hardware.
- Height Needed: Measure the obstructions you need to clear before selecting extension length — you can often stack multiple extensions.
- Environment: For saltwater use, prioritize corrosion-resistant materials throughout your entire antenna system.
Top Brands in Antenna Extensions
Shakespeare Antennas is the dominant name in marine antenna extensions, and for good reason. Founded in 1897 by William Shakespeare Jr. in Kalamazoo, MI as a fishing reel manufacturer, the company quickly expanded to manufacture fishing line, fiberglass fishing rods, and antennas, opening a factory in Columbia, SC in 1946. With a strong emphasis on innovation throughout its 120-year history, Shakespeare's milestones include the development of low-angle radiation techniques for marine antennas, as well as the introduction of fiberglass radomes, hand-soldered connections, brass and copper elements, and metal ferrules. Today, Shakespeare is regarded as a leading global antenna brand serving both military and civilian maritime customers. Their antenna extensions carry that same tradition of craftsmanship, offering boaters and RV owners a reliable, well-engineered way to optimize their antenna placement.