Sea-Dog Stainless Steel Fixed Antenna Base – 4" H x 2-7/8" Base | SED-329510-1
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You have 30 days to request a return. All sale items are final sale.
Sea-Dog Stainless Steel Fixed Antenna Base – 4" H x 2-7/8" Base
A solid, permanent deck mount for VHF, AIS, GPS, and other standard marine antennas. This all-stainless steel fixed antenna base from Sea-Dog stands 4" tall with a wide 2-7/8" base footprint — providing a stable, low-vibration platform that resists the flex and wobble common on narrower bases, especially on planing hulls at speed.
The built-in wire feed-through routes your coax cable directly through the base for a clean, professional installation with no exposed cable on deck. The standard 1"-14 thread accepts the vast majority of marine antennas, and the wide base distributes load across a larger mounting footprint for a more secure hold on fiberglass and composite decks.
Key Features
- All stainless steel construction – corrosion-resistant for marine use
- 4" height with 2-7/8" base diameter – wide, stable footprint
- Built-in wire feed-through – clean coax routing below deck
- Standard 1"-14 thread – fits most marine antennas
- Reduced antenna flex and vibration at speed
- MPN: 329510-1
Parts Desk Insights
Best Use Case: This base is the right choice when stability matters — on faster planing hulls, sportfishers, and center consoles where vibration and antenna wobble at speed are a concern. The wider 2-7/8" base spreads the load and reduces the lever arm effect that causes narrower bases to flex under a tall antenna. It's also a good fit for larger, heavier antennas where a narrow base would be undersized. For a lower-profile option with the same wire feed-through design, see the Sea-Dog Fixed Flange Antenna Base – 1-1/2" or the Sea-Dog Fixed Flange Antenna Base – 4-1/2". To raise the antenna further above deck, pair 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.
Installation Note: The 2-7/8" base requires a larger mounting footprint than standard flange bases. Confirm you have adequate flat deck space and access below for the coax feed-through before ordering.
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.