For antenna tuners & SWR meters, the hard part is matching the tuner's stated power, frequency, and operating format to your radio-not simply choosing the longer feature list. AT-100M and MFJ-941E take different approaches, so the useful question is whether portability or hands-on control matters more. Their listed conditions and prices add another practical filter.
Quick verdict
Choose AT-100M when its built-in lithium battery and Type-C charging matter; choose MFJ-941E when the lower listed price and manual-tuner wording matter more. The listed price gap is $56.98. The practical split is portable charging versus hands-on tuning, with the named features making the choice more specific than a simple meter comparison.
Listed comparison
| Comparison point | AT-100M | MFJ-941E |
|---|---|---|
| Listed price | USD 141.98 | USD 85.00 |
| Listed condition | New | Used |
Where each product wins
AT-100M: portable charging and HF range
AT-100M wins for a feature combination aimed at portable use. Its built-in lithium battery and Type-C interface support outdoor use, giving the design a concrete reason to choose it. The 1.8MHz-30MHz range is another useful divider for shoppers comparing HF coverage. If those charging and frequency details fit your operating plan, AT-100M is the direct match. The range is a stated number, not a reason to assume better performance across every antenna or station.
MFJ-941E: radio fit and listed power figure
MFJ-941E wins for a buyer who wants an antenna tuner expressly associated with a ham radio transceiver. Both names include SWR measurement language, so that meter category is shared rather than a reason to declare a winner. MFJ-941E's distinct decision points are its explicit ham-radio-transceiver fit and 300W rating. Treat the number as a listed specification, not an automatic quality verdict. For a station where that fit and power figure are the brief, MFJ-941E is the more targeted choice.
Product notes
AT-100M Universal HF Antenna Tuner
AT-100M earns consideration when the station uses several named modes: SSB, CW, AM, FM, and FT8. The unit carries a 100W rating, while FT8 transmit power should not exceed 50W. That is the concrete limitation for digital operation, even though the broader mode list helps define the intended use. The universal HF antenna tuner wording keeps the purpose clear. Choose AT-100M when those mode details and stated power boundaries fit the radio; the 50W FT8 ceiling should remain part of the buying brief.
MFJ-941E Deluxe Versa Tuner II
MFJ-941E suits a buyer who wants an SWR wattmeter as part of a hands-on setup. It is a manual antenna tuner, so the tuning style is a clear part of the choice rather than an implied feature. Its concrete limitation is condition: MFJ-941E is listed as used, so condition belongs beside the feature comparison. The manual design and meter wording make the unit a focused fit for a radio operator who prefers that workflow. Choose MFJ-941E when those named traits fit the station and hands-on control is welcome at the radio.
Final choice by use case
- For outdoor operation: choose AT-100M. Outdoor use is explicitly part of its stated purpose, making its portable-oriented design the relevant match.
- For the stated power-and-radio-fit brief: choose MFJ-941E. Its 300W rating and explicit ham-radio-transceiver fit are the concrete reasons to favor this route; the numeric rating is still a specification, not a universal performance promise.
- For the lower listed price: choose MFJ-941E at USD 85.00. AT-100M is USD 141.98, a $56.98 spread. That spread makes MFJ-941E the price-led pick; AT-100M makes more sense when its listed feature mix matches your station.
