Tram 1411 vs Diamond D130J: Which Scanner Antenna Should You Buy?
Both the Tram 1411 and Diamond D130J are broadband discone antennas that cover scanner frequencies from 25 MHz to 1300 MHz. The Tram costs about half as much. The Diamond has better connectors and build quality. Here's the honest breakdown of when each is the right choice.
Quick Answer: Which Should You Buy?
Choose Tram 1411 If:
- You're setting up your first scanner antenna
- Indoor, attic, or temporary outdoor use
- Budget is a consideration
- You have a short coax run (under 25 feet)
- Your scanner has a BNC connector
Choose Diamond D130J If:
- Permanent outdoor rooftop or mast mount
- Long coax runs (50+ feet)
- Harsh weather environments
- You want the best available discone antenna
- You already run N-connector coax
Feature Comparison
| Feature | Tram 1411 | Diamond D130J |
|---|---|---|
| Price | $79.99 | $137.99 |
| Type | Broadband Discone | Broadband Discone |
| Frequency Range | 25–1300 MHz | 25–1300 MHz |
| Connector | BNC Female | N Female (lower loss) |
| Impedance | 50 ohm | 50 ohm |
| Max Power | 50W | 150W |
| Build Quality | Good | Excellent |
| Weather Resistance | Moderate | High |
| Best Install | Indoor / short runs | Outdoor permanent |
What Actually Matters
RF Performance: Essentially Equal for Scanner Use
In the 100–900 MHz range where public safety communications live, the Tram 1411 and Diamond D130J produce nearly identical receive performance. Both are passive discone antennas with similar gain patterns. The meaningful performance gap between them is at the connector, not the element.
Connector Type: N vs BNC
The Diamond D130J's N connector has lower insertion loss than BNC — a measurable but small difference at VHF/UHF frequencies. For runs under 25 feet, this is negligible. For runs of 50 feet or more (typical roof-to-basement installations), switching from BNC to N throughout the system reduces cumulative signal loss. If your coax run is short, this difference won't matter. If it's long, the Diamond's N connector is one reason to choose it.
Build Quality and Longevity
Diamond antennas are generally built for long-term outdoor use. The D130J's housing and radials handle UV exposure, wind, and rain better than the Tram 1411 for multi-year outdoor installations. For indoor or semi-outdoor use, the Tram 1411 holds up well and many users report years of reliable service. For a rooftop mount that you won't touch for five years, the Diamond justifies its price.
Adapter Considerations
The Tram 1411's BNC connector plugs directly into most dedicated scanners (Uniden, Whistler, Bearcat) without adapters. The Diamond D130J requires an N-to-BNC or N-to-SMA adapter at the antenna feedpoint or scanner end. Quality adapters add a few dollars — not a dealbreaker, but worth noting when comparing total cost.
Best Antenna by Installation Type
Desktop / Indoor
Winner: Tram 1411
Lower cost, BNC connector fits most scanners directly, completely adequate for indoor use.
Attic Mount
Winner: Tram 1411
Protected from weather, short coax run. Tram's value is ideal here.
Outdoor Rooftop
Winner: Diamond D130J
Better weather sealing and build quality for a permanent outdoor install.
Long Coax Run (50+ ft)
Winner: Diamond D130J
N connector with quality coax minimizes cumulative signal loss over long runs.
First Scanner Antenna
Winner: Tram 1411
Budget-appropriate, plug-and-play with most scanners, massive upgrade over a rubber duck.
SDR Setup
Either
Both work well with RTL-SDR dongles via an adapter. Choose based on your coax run length.
Frequently Asked Questions
What is the difference between the Tram 1411 and Diamond D130J?
Both are broadband discone antennas covering roughly 25–1300 MHz. The main differences are connector type (Tram uses BNC, Diamond uses N), build quality (Diamond is more robust), and price (Tram is roughly half the cost). Performance in the VHF/UHF scanner range is similar, but Diamond's N connector reduces signal loss for users running longer coax runs.
Which antenna is better for a police scanner?
For most home scanner users, the Tram 1411 delivers excellent value. The Diamond D130J offers marginally better build quality and connector type, which matters if you're running 50+ feet of coax or mounting outdoors long-term. Both significantly outperform the rubber duck antenna included with handheld scanners.
Can I use these antennas indoors?
Yes. Both work indoors, though performance improves dramatically with outdoor mounting or at least window placement. The Tram 1411 is popular for attic and desk mounting due to its lower cost. For serious outdoor use, the Diamond D130J's weather resistance gives it an edge.
What connector do these antennas use?
The Tram 1411 has a BNC female connector. The Diamond D130J has an N female connector. Your scanner or SDR likely has SMA or BNC. The Tram is plug-in compatible with BNC-equipped scanners (like the BCD436HP, SDS100). For the Diamond, you'll need an N-to-SMA or N-to-BNC adapter.
Do I need a ground plane for a discone antenna?
No. Discone antennas are self-grounded by design — the radial elements serve as the ground plane. This is one advantage discones have over simple vertical antennas that require a proper ground plane. Just mount the discone upright with the radials pointing downward.
Take Action for Transparency
Your voice matters. Here are concrete ways to advocate for open police communications in your community.
Contact Your Representatives
Use our templates to email your local officials about police radio encryption policies.
Get StartedRead Case Studies
See how encryption has affected real communities - from Highland Park to Chicago.
View CasesSpread Awareness
Share evidence about police radio encryption with your network and community.
Public Testimony
Learn how to speak effectively at city council and public safety meetings.
Prepare to Speak