POTA Pounder vs Super Antenna UM3SP: which ground spike mount is right for you?
Looking at the Super Antenna UM3SP SuperMount with SuperSpike (also listed as UM3 SuperMount + SP3 SuperSpike)? Here’s how it compares with the POTA Pounder, using each seller’s published specs.
Quick answer
Choose the Super Antenna UM3SP if you want the lowest price, mostly operate on soft ground, or already own Super Antenna gear like the MP1.
Choose the POTA Pounder if you operate on hard or rocky ground, want a stainless spike, or need M10 threads.
We make the POTA Pounder, so we’ve been careful to say where the Super Antenna UM3SP does better too.
Specs side by side
| Feature | POTA Pounder (ours) | Super Antenna UM3SP |
|---|---|---|
| Price | $9.99 (plate only) to $42.99 (complete kit with spike) | $29.99 on Amazon. $14.95 at Ham Radio Outlet when we checked, but HRO sells the SP3 spike alone for $39.95, so that may be a short-term deal |
| Spike material | Solid stainless steel | Aluminum |
| Spike length | About 8.5 in (22 cm) | About 11.4 in (29 cm) |
| Spike thickness | 3/8 in or M10 (about 10 mm) | 9 mm |
| Spike-to-plate thread | Your choice: 3/8-24 or M10 | 3/8-16 |
| Antenna thread | 3/8-24 (M10 antennas need an adapter) | 3/8-24 |
| Coax connector | SO-239 elbow | SO-239 |
| Radial connections | Quick-disconnect terminals | Two 6 mm (1/4 in) push-on tabs |
| Weight | 12.5 oz complete (spike alone 6.7 oz) | About 5.4 oz (0.34 lb, per one dealer listing) |
| Can you buy parts separately? | Yes: plate only, plate with SO-239, or complete kit | Yes: UM3 plate and SP3 spike sold separately |
| Where to buy | Ham Radio Dude on Etsy | Ham Radio Outlet, Amazon, other dealers |
Where the Super Antenna UM3SP does better
- Lower price: $29.99 on Amazon, and $14.95 at Ham Radio Outlet when we checked (that may be a short-term deal).
- Longer spike (about 11.4 in) grips better in soft or sandy ground.
- Lighter overall, because the spike is aluminum.
- Dealers list a 20 mph wind rating.
- The plate’s 3/8-16 hole also fits many camera tripods.
Where the POTA Pounder does better
- Solid stainless steel spike instead of aluminum. Stainless is harder and stiffer, so it holds up better when you push it into hard, rocky ground.
- Choose 3/8-24 or M10 threads to match the gear you already own.
- Buy just the plate if you already have a spike, from $9.99.
- Rated 5.0 out of 5 by Etsy buyers, and you can message the maker directly.
What POTA Pounder owners say
Been using this a lot and it was well worth it to me. Built tough unlike aluminum spikes I’ve found sold through big billionaires are us websites. Thank you!
Great devices as usual! Amazing guy!
Well made, sturdy and great concept with the 90 degree angle connector.
See it in use
Common questions
Is the POTA Pounder a good alternative to the Super Antenna UM3SP?
For many operators, yes. The POTA Pounder is a good pick if you operate on hard or rocky ground, want a stainless spike, or need M10 threads. The Super Antenna UM3SP is the better pick if you want the lowest price, mostly operate on soft ground, or already own Super Antenna gear like the MP1.
What is the main difference between the POTA Pounder and the Super Antenna UM3SP?
The Super Antenna UM3SP: lower price: $29.99 on Amazon, and $14.95 at Ham Radio Outlet when we checked (that may be a short-term deal). The POTA Pounder: solid stainless steel spike instead of aluminum. Stainless is harder and stiffer, so it holds up better when you push it into hard, rocky ground.
Do I still need radials with a ground spike mount?
Yes, for most vertical antennas. The spike holds the antenna up, but pushing metal into the ground is not a good RF ground by itself. Clip a few radial wires to the mount’s terminals and lay them out on the ground.
What does 3/8-24 mean?
It is the standard thread on most portable HF verticals and mobile whips: 3/8 inch wide, 24 threads per inch. M10 is the metric thread some antennas use instead.
More comparisons
Where these specs come from
- Ham Radio Outlet: UM3SP listing
- Ham Radio Outlet: SP3 SuperSpike sold alone ($39.95)
- WiMo: SP-3 SuperSpike specs
- Amazon: UM3SP listing
- Our own specs come from our product listings.
We checked every listing on October 30, 2026. Prices and stock change often, so check the seller before you buy. Where a seller doesn’t publish a spec, we say “Not listed” instead of guessing. Spot a mistake? Message us on Etsy and we’ll fix it.
Super Antenna UM3SP are names and trademarks of their owners. Ham Radio Dude is not affiliated with or endorsed by them.