GNSS Multi-Band L1/L2 Surveying Antenna - TNC (TOP106)

The TOP106 from TOPGNSS is a certified GNSS/GPS surveying antenna capable of receiving the L1/L2 bands for GPS, GLONASS, Galileo, and BeiDou constellations. These 'UFO' antennas have incredible performance for the money. The antenna has a built in ground plane with significant filtering and amplification of both L1 and L2 frequencies for all GPS, GLONASS, and BeiDou satellites. Excellent for surveying or fixed antenna applications. If you can handle the extra weight and size in your application, the TOP106 is the best antenna we've played with to date.

The TOP106 without RF shield is ideal for handheld surveying or portable applications. It is smaller and lighter weight than the BT-147 weighing in at 422g. For automobile applications please see our u-blox ANN-MB-00 GNSS antenna. For weight sensitive applications (like RTK Drones) checkout the BT-560 helical GNSS antenna.

Designed for the latest u-blox F9 platform it provides a fast, easy, and reliable multi-band antenna solution but can be used with any GPS/GNSS receiver that can benefit from the L1/L2 dual reception. While this antenna works great with normal L1 GPS/GNSS receivers it will not make your $20 receiver into a $200 receiver. Please check your receiver to verify it is capable of using the L1 and L2 signals that this antenna outputs.

We disassembled a unit because we love to see how things work! The antenna incorporates a 130mm ground plane with six hybrid couplers to obtain signal phasing which makes this design a lot more insensitive to manufacturing-imposed issues (e.g. board material with inconsistent dielectric).

This antenna has been certified by the National Geodetic Survey. You can see the exactly find the SFETOP106 antenna data on the NGS Antenna Calibrations website.

Note: This antenna has a TNC female connector found on nearly all surveying antennas. We recommend our TNC Male to SMA cable when used with our GNSS receivers.

Note: This antenna uses a standard 5/8"-11TPI (threads per inch) connector found on surveying equipment. This is not compatible with a camera tripod. We recommend a 5/8" to 1/4" tripod adapter. You can also find 5/8"-11TPI threaded rod in most hardware stores in North America. For information about permanently fixing this antenna to a roof, please see our tutorial on How to Build a DIY GNSS Reference Station.

  • Gain: ≥5dBi
  • LNA Gain: 40dB
  • Reception Frequencies
    • L1: 1555 to 1615MHz
    • L2: 1198 to 1278MHz
  • 50 Ohm Antenna Impedance
  • Overall antenna weight: 335g
  • Bare antenna element weight (including MMCX connector, with RF shield): 160g
  • Dimensions: 148 x 55mm
  • Waterproof IP67
  • Connector: Female TNC


Looking for answers to technical questions?

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Customer Reviews

4.3 out of 5

Based on 15 ratings:

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1 of 1 found this helpful:

Works good, but may leak water

Followed the tutorial to make a DIY GNSS Reference station and it worked great for a few months. Stopped working and took it off the mount and it is full of water. Tried shaking it to try and see where the water got in, but the water isn't coming out

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2 of 2 found this helpful:

EXCELENT multi-Band Antenna

Fully recommended. An excellent antenna. Good value for money. It captures the signal of all the satellites available in the area. Currently I use it with an Emlid Reach M2 and I can compare its performance with other gnss that I have at work and this little antenna is capable of receiving the same amount of satellites as expensive antennas and expensive devices.

Works well with the RTK Express

I purchased the GNSS Multi-Band L1/L2 Surveying Antenna (TNC) together with an RTK Express and mounted them both on a monopod. As soon as I connected the SW Maps app to an NTRIP station (MassCORS in this case) my errors dropped to .05m. Very cool. Make sure you get the little adaptor nut of you will be mounting it on a camera tripod or monopod.

It is perfect

I am making the world's first opal detector, I need absolute accuracy to pinpoint on a digital map for my clients to show them where they can go back to extract the opal. It is an excellent size for my detector. It is in the same size proportion as the rest of my detector. So it does not look out of place. It is easy to assemble and transport. I have not used it yet but if it does what you say it will I will be over the moon.

Its incredible!!!

Good Morning, its and incredible product i love it!! 5 stars to GNSS Multi-Band L1/L2 Surveying Antenna (TNC) - TOP106!!!! thank you so much to the spark fun team!

Does the job!

I'm using it with a GPS-RTK-SMA (ZED-F9P) as a time and position reference. The only down-side I could find is that it's not registered in the IGS database so getting a reliable calibration is a little tricky. The L1/L2 phase offsets are in the datasheet (L1: 43.60, L2: 39.60) however so I was able to scan the ANTEX file from the NGS to find an antenna that has the same difference between the L1 and L2 offsets. The closest I could find was the HITINNO1 (Hi-Target maybe?) so I used that and adjusted my ARP height to account for the difference. It's not exact but it's close enough for my purposes.

Oh, if you're going to use this antenna in a fixed location, I'd suggest making a cable (RG-58 or better) with a TNC connector to avoid the adapters.

EDIT 2022-10-15: I just noticed that the antenna's calibration data is now in the official databases as SFETOP106. YAY (and thanks)!


Works exceptionally well.

I am using two of these in conjunction with two F9Ps for a GNSS setup. I am looking at an uncorrected accuracy of <0.08m in both Lat and Long with a very clear view of the sky while moving. I also use the second F9P for a moving base heading calculation, and while the heading isn't given for every RTCM series correction sent, it is reliable for enough of them that I can trust it for navigation. Overally, this antenna is fantasic.

I'm very pleased and want to buy another one!

This antenna is doing the same job as the brand name $3,000 antenna for only 130 bucks. It's amazing and saved me a lot of money! I'm saddened by the fact that it is now back ordered indefinitely on your website. Please bring it back!

Worked as expected.

Arrived quickly and well packaged. Just a few days US to New Zealand. Giving good performance in our timing application. Will continue to by from Sparkfun.

Solid Performer

This antenna tracks our moving boat perfectly every time.

Works very well but after a year gets waterlogged and dies

Most of our installations have been in Oregon. After a year they would stop working so we opened it up and found that it was 1/2 full of water. They do an amazing of sealing but when the temperature changes it sucks water through the area between the mounting thread insert and the plastic body where it is pressed together. We drilled a small 1.5mm hole in the plastic next to the brass threads to keep it from developing negative pressure inside. This seems to have worked. I would have probably given it a higher score if they had just answered my support request. We will keep using this.

Thanks for the review. Sorry we did not get back to you there. If you want, you may try Emailing us again at and we can get you taken care of right away.

Excellent performance until water gets in

I bought a couple of these to live outside, and since they are IP67 I figured I made the right choice! Well like others have said, water WILL eventually get inside and ruin them. It took about a year for the performance to drop to the point where I could only pick up 2-3 satellites reliably. Now I can hear water inside when I shake them. I'm giving them 3 stars because they do work, they're just not as weather resistant as the IP rating led me to believe. Going to try the SPK6618H next, hopefully those are more robust?

Great GPS unit

I've been unable to get an official survey of my property.

I've used this to get an unofficial survey of the water boundary, building area and electrical line and well site for my future home.

This gives me detailed information for my planning documents for permits, since there's offsets from all the locations required for septic systems in the area.

I just wish I could by two. Then I could do a pretty official property boundary based on the section corner in the neighboring lot.