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Reviews Categories | Antennas: VHF/UHF+ Omnidirectional: verticals, mobile, etc | Comet GP-6 - Dual Band Help

Reviews Summary for Comet GP-6 - Dual Band
Comet GP-6 - Dual Band Reviews: 26 Average rating: 4.1/5 MSRP: $150
Description: Dual Band Antenna. 2 meter and 70 cm
Product is in production.
More info: http://
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K6KQV Rating: 5/5 Aug 30, 2011 16:20 Send this review to a friend
Good Antenna  Time owned: more than 12 months
I have had my GP-6 about 5 years. It is still watertight and performs as well as it did when it was brand new. The instruction sheet is rather poor. As others have mentioned, the top section is pushed up inside the radome and there are no instructions on how to get it out. Tapping it on ther carpet solved the issue.
N8QLT Rating: 4/5 Jul 1, 2011 14:58 Send this review to a friend
Bad instructions, nice antenna  Time owned: 0 to 3 months
I have to attribute my success in getting this thing assembled to N5LUQ's mention of how to get the darn upper element to mate with the lower element. Like him, I also found that there were two holes for hex set screws to hold the upper element in, but only one set screw is provided.

The instructions are bad, and it would be so easy to improve them. The most puzzling issue is why they jam the upper copper element so far up the upper radome without any hint about how to get it back down to a position where it can be inserted into the lower element socket and secured with the set screw. N5LUQ's hint about tapping the upper element on a carpet until the element can be grabbed with pliers and pulled out a little saved me a lot of frustration.

This antenna replaced a 25-year old Cushcraft AR270 dual band VHF/UHF vertical. Works just as well and I'm happy with it. I expected it to perform significantly better than the old AR270, but it's on par. Doesn't blow away the old antenna, but it's worth the money and I'd purchase this antenna again.
SAPPHIRE Rating: 5/5 Mar 1, 2011 04:38 Send this review to a friend
Good gain  Time owned: more than 12 months

Building good performance excellent. Comet GP6 is better than the x300 as diamond output. Were tested under the same conditions.

W5GSR Rating: 5/5 Jul 11, 2009 18:05 Send this review to a friend
Great antenna for the base radio's and for my repeater  Time owned: more than 12 months
I have two,one is used for the base radio's and the other replaced the Jetstream jtb2 that was used for my 440 repeater,the 440 side on the jtb2 antenna messed up for some reason.The swr on both GP6's is great.
N5LUQ Rating: 4/5 May 30, 2008 22:36 Send this review to a friend
Great Performer, Poor Instructions, Less than rigid sleeve to a  Time owned: 0 to 3 months
I purchased the Comet GP-6 from my local ham store after lots of research. It looked like the one that would give me the gain I wanted with only two sections. When I got it home and tried to put it together the top sections male copper rod was recessed far back into the tube and would not come out. After frantic phone calls I learned that one has to slam the top section on the carpet( not on a hard surface) and force the rod down far enough so you can grab it with some pliars. It then mates up with the female lower section with two set screws, one of which was missing from my package. Poor QC here. I had to use a homebrew slotted screw to complete this phase. The coax then goes through a sleeve which is then fastened to the antennae by one bolt and a lock washer. This is not a very secure arrangement, in my humble opinion. The sleeve has two U bolts on it which then fastens to the mast. This is not near as good of a mechanical connection as was on my G6-144 Hustler 2 meter antennae which stayed up in the elements for 20 years. I related all of this to Mike Stwerdnik at Comet. He did not see any need for improvement over what was already there both in the instruction paper and in the mechanical arrangement, as he said he has put hundreds of them together.
Does it work? You bet! The performance is GREAT with the SWR at between 1.1 and 1.3 on all VHF and UHF frequencies regardless of power. It appears to be working fine.
I gave it a 4 instead of a 5 because of the mechanical concerns I have. I will let you know how it fairs in the Texas violent wind and rain storms this spring and summer. It leans a little already which I think stems from the single point connection with the
KI4HWC Rating: 5/5 Apr 15, 2006 18:37 Send this review to a friend
Great Antenna  Time owned: more than 12 months
Great 2M/440 daul band antenna,I have had it for 1 year and it works great, I can get at least 50 mile in the Hilly Tennessee Area
KC0WEO Rating: 5/5 Apr 12, 2006 07:57 Send this review to a friend
Wow  Time owned: 0 to 3 months
Being new to the hobby, my first transmission was on 2m using an FT-897 on 50w. I was reaching out over 150 miles on simplex. RST was 5/9, full quieting and contacts were amazed (and still are). My installation is a roof top tripod at 12ft with 8ft mast. SWR was 1:1 until I added an arrestor which ^ to 1:5. Last few days were windy, gusts to 25 and it appeared stable without movement.
No guys are being used as yet.

Very impressed.

WB1AEX Rating: 5/5 Apr 26, 2005 19:22 Send this review to a friend
Durable and effective  Time owned: 0 to 3 months
I was skeptical when I plunked my cash down, but quickly became convinced after squaring away my feedline and running some checks with my GP-6. This antenna has considerable gain on 70cm and 2 meters. I placed mine at about 50 feet, within 10 feet of several other VHF and UHF antennas, and it works extremely well. It has more gain on 440 and on 146 than my log periodic beam, which claims 6 - 8 db gain on both bands. Pretty amazing considering the GP-6 is providing me gain in all directions. On 70cm the SWR is flat at 443mhz and climbs to about 1.4 at the upper and lower edges that I use when accessing repeaters on 440. Repeaters that were S-7 on the log periodic are S-9+ on the GP-6. On 2 meters the SWR is flat at 146mhz and rises to about 1.4 at the band edges of 2 meters. Repeaters that were S-7 on the log periodic are at least a full S unit better on the GP-6. On both bands, I can hear repeaters that I could not hear with the log periodic. Initially I fed this antenna with about 50 feet of RG8U-95 S.I.W. - brand new stuff and decent quality but not what I intended to use on 440 permanently. No problem on 2 meters, but on 440 mhz I found the SWR to be about 1.6:1 where I operate and generally favoring the upper end of the 440 band. When I got around to replacing the RG8 with 50 feet of LMR400 the SWR curve fell right where it was advertised to be and was flat at the resonant points of both bands. If you are seeing a high SWR, as some reviewers appear to be, you might want to look at your feedline. In my case, it was definitely the culprit. Received signals were way better on 440 mhz with the LMR400 feedline. As a bonus, the antenna receives very well on frequencies outside of the ham bands. I use it with my FT897 and it hears the commercial aircraft band and the VHF/UHF public service bands very well. The Rutland Vermont weather station (120+ miles away) on 162.425 is S-5 here in north central Connecticut on the GP-6. It was S-3 on the log periodic. If you are looking for a well constructed antenna that actually does what it is advertised to do, this one will not let you down.

NT9E Rating: 5/5 Apr 6, 2004 19:09 Send this review to a friend
Superior performance  Time owned: more than 12 months
I've had my GP-6 since Nov 2002. I've installed it with the tip at 55 ft and can work anyone I hear.
SWR Bandwidth (at my installation w/Comet MX72N duplexor)
420-450 1.5:1 or less
144-148 1.7:1 or less
147-148 1.6:1
145-147 1.7:1
144-145 1.2:1
K9DRX Rating: 4/5 Jun 30, 2002 13:59 Send this review to a friend
Not bad for the price  Time owned: 3 to 6 months
My SWR readings after the antenna has been up for 4 months:

144 1.9:1
146 1.6:1
148 1.9:1
150 1.4:1
154 3.0:1
440 2.8:1
442 1.8:1
444 2.1:1
446 2.5:1
448 2.0:1
450 1.5:1
455 1.5:1
460 2.1:1

I must say it has been better at times. It may be the hot/humid weather we have currently. Nearly FLAT SWR at 460 and 146 in the past. 440 has always been higher around 2 to 2.5 but still not that bad considering how wide-banded this antenna seems to be. I also get very good SWR on VHF Marine band with it. It may not be the best dual band Ham antenna available, but it's ability to operate a huge spectrum of frequencies with less than 2.5:1 is greatly desired. I am very happy with it. I have no problem accessing 440 repeaters at 10 watts 80 miles accross lake Michigan. 2 Meter is always good and so far I can't complain. Obviously, there are better antlers out there but for the PRICE, this antenna shouldn't be put down.
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