Cobra RG-59 Co-Phase Coaxial Cable – 9 ft with Soldered PL259 Connectors
4.1 (8)
$24.95$12.48
The Cobra 9 ft RG-59 co-phase coaxial cable with soldered PL259 connectors splits signal to dual CB antennas for matched performance, buyable online for $12.48 — 50% off the $24.95 compare-at price.
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The Cobra RG-59 Co-Phase Coaxial Cable – 9 ft is purpose-built for dual CB antenna setups on trucks and big rigs, using soldered PL259 connector ends for maximum signal integrity. Order online today for $12.48 — 50% off the $24.95 compare-at price.
What Is a Co-Phase CB Antenna Cable?
A co-phase harness splits your radio's signal equally between two antennas, phasing them to work together. Done right, dual co-phased antennas boost transmit and receive performance and reduce skip interference — a favorite setup for 18-wheelers and Jeep owners running dual whips.
How to Install a 9 ft RG-59 Co-Phase Cable for Dual CB Antennas
Mount both antennas symmetrically — mirror positions on mirrors or fenders.
Connect the single end (with the T-junction) to your radio's SO-239 jack.
Run each 9 ft leg to one antenna — equal lengths keep the phasing matched.
Key channel 20 and check SWR; trim both antenna whips evenly if needed.
RG-59 vs RG-58 for Co-Phase
RG-59's larger core handles the split signal with lower loss, which is why it's the standard choice for co-phase harnesses. RG-58 is better suited to single-antenna runs like the Cobra 18 ft cable.
Specifications
Brand: Cobra
Cable Type: RG-59 co-phase harness
Length: 9 ft
Connectors: Soldered PL259 ends
Config: One radio input, two antenna outputs
Best For: Dual antenna truck and Jeep installs
Price & Deal Value
$12.48 online — a 50% discount off $24.95. Stack coupon OUTPOST12 for an extra 12% off and get free shipping on orders over $45.
Features
Purpose-built RG-59 co-phase design splits signal evenly to two antennas for stronger dual-antenna CB performance
Soldered PL259 ends provide a solid, low-loss connection that survives road vibration better than crimped connectors
$12.48 sale price — 50% discount off $24.95, with an extra 12% coupon deal at checkout
Length: 9 ft
Best For: Trucks, big rigs, and dual-antenna Jeep setups
Cable Type: RG-59 Co-Phase Harness
Connectors: Soldered PL259 ends
Product Type: Dual CB Antenna Coaxial Cable
Configuration: 1 radio input / 2 antenna outputs
Seller: PowerHaven Outpost
Product Details
Cobra RG-59 Co-Phase Cable: Dual Antenna Power at Half Price
For $12.48 — 50% off $24.95 — you get a genuine Cobra co-phase harness that turns two antennas into one stronger signal.
Choose the Right Coax
One antenna: Cobra RG-58 18 ft cable
Two antennas: This RG-59 9 ft co-phase harness
Deal Snapshot
$12.48 | 50% savings | Extra 12% with coupon OUTPOST12 | Free shipping over $45.
Frequently Asked Questions
What is a co-phase CB antenna cable?
It's a harness that splits your radio's signal equally between two antennas, phasing them for improved transmit and receive performance compared to a single antenna.
How do I install the Cobra 9 ft co-phase cable for dual antennas?
Mount both antennas symmetrically, connect the single end to your radio, run one 9 ft leg to each antenna, then check and trim SWR evenly on both antennas.
RG-59 vs RG-58 co-phase coax — which is better?
RG-59 is the standard for co-phase dual-antenna harnesses due to its larger core and lower loss. RG-58 is better for single-antenna runs.
Will this work with my truck and dual antennas?
Yes. It's designed for dual antenna setups on semi trucks, pickups, and Jeeps using any CB radio with a standard SO-239 antenna jack.
What's the current price and deal?
$12.48 online — 50% off the $24.95 compare-at price. Apply coupon OUTPOST12 for an additional 12% off. Free shipping over $45.
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Customer Reviews
8
★★★★★★★★★★5.0
t***j
Dual antennas finally matched
Wired up my co-phased mirror mounts with this and both antennas read identical SWR. Trucks come back loud and clear now. Excellent build quality.
★★★★★★★★★★5.0
p***w
Verified
Great splitter coax
Clean signal to both antennas. Works as advertised.
★★★★★★★★★★5.0
m**m
Verified
Noticeable improvement over single antenna
I run dual antennas on my Peterbilt and this co-phase harness made an immediate difference. The soldered PL259 connectors are solid, unlike the crimped junk I had before, and signal checks show both whips are matched. Skip the cheap cables and buy this one.
★★★★★★★★★★5.0
m*****z
Verified
Well made, fair price
You can tell Cobra didn't cut corners here. The solder joints look professional and the RG-59 is thick and well shielded. My dual setup has never transmitted better, and half off made it an easy decision.
★★★★★★★★★★4.0
z*f
Verified
Good coax, routing takes thought
Matched my dual antennas without trouble and SWR is low on both sides. Nine feet is fine for most pickups but measure before you order. Otherwise no complaints.
★★★★★★★★★★4.0
m****l
Verified
Does the job right
Been on the road two years with this coax and zero issues. Soldered connectors hold up to weather and vibration.
★★★★★★★★★★3.0
c*****o
Verified
Works but a little short
Quality seems good and signal splits evenly. I just barely had enough length for my crew cab, so bigger rigs might need to plan carefully.
★★★★★★★★★★2.0
n**z
Verified
One connector arrived loose
One of the PL259 connectors had play in it out of the box, so I had to re-seat the solder joint myself. Performance is fine now but quality control should be better.
