Sea-Dog 304 SS Fixed Flange Antenna Base – 4-1/2" | SED-329515-1
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Sea-Dog 304 SS Fixed Flange Antenna Base – 4-1/2"
Get your VHF, AIS, or GPS antenna up and away from deck clutter with this 4-1/2" fixed flange antenna base from Sea-Dog. Formed from 304 stainless steel with a built-in wire feed-through channel, it delivers a clean, permanent deck or cabin top installation — routing your coax cable directly through the base so there's no exposed cable run on the mounting surface.
The extra height compared to a low-profile base gives the antenna a head start above deck hardware, cleats, and rails without needing a separate extension. The flat flange bolts securely to any horizontal surface, and the standard 1"-14 thread accepts the vast majority of marine antennas.
Key Features
- Formed 304 stainless steel – corrosion-resistant for coastal and inshore use
- 4-1/2" height – raises antenna above deck hardware without a separate extension
- Built-in wire feed-through – routes coax directly through the base
- Standard 1"-14 thread – fits most marine antennas
- Flat flange design for deck, cabin top, or horizontal surface mounting
- MPN: 329515-1
Parts Desk Insights
Best Use Case: This is the right base when you want a clean deck installation with hidden coax routing and enough built-in height to clear low deck hardware — cleats, hatches, or toe rails — without adding a separate extension. It's a popular choice on sailboats and trawlers where the antenna needs to sit above deck-level obstructions but a full extension would be excessive. If you only need minimal height above the mounting surface, see the shorter Sea-Dog 304 SS Fixed Flange Antenna Base – 1-1/2". To raise the antenna even further, pair this base with a Sea-Dog 316 SS Antenna Mount Extension – 12" or the Sea-Dog 316 SS Antenna Mount Extension – 24". For rail or arch mounting without deck penetration, see the Sea-Dog 316 SS Tube Mount Antenna Base.
Material Note: This base is formed 304 stainless steel, well suited for coastal and inshore environments. For offshore or heavy saltwater exposure, consider the 316 SS options in the Sea-Dog antenna base range.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.