2m · 70cm

Bands

200 W

Rated

Frequency	144-148 / 440-450 MHz
Gain	2.15-3.0 (2m, dealer sheets disagree) / 5.5 (70cm) dBi (70 cm figure unanimous; 2 m figure varies by dealer sheet (some print 3.0, others 2.15) and the maker's US site publishes no text specs - both kept, flagged)
TX power	200 W (200 W (consistent across dealer spec sheets))
Modes	FM, SSB, CW, digital
Weight	200 g (7.1 oz)
Connector	NMO mount, black whip (the NR770H family spans PL-259/NMO and chrome/black variants)

Connectors

feedpoint

NMO

Estimated (unverified): 2 m gain (2.15 vs 3.0 dBi across dealer sheets); exact length (38.2 vs 40.2 in across dealer sheets); weight

The reference mid-size dual-bander: ~40 inches (sheets disagree between 38.2 and 40.2), half-wave on 2 m over two phased 5/8-waves on 70 cm 5.5 dBi on 70 cm is unanimous; the 2 m figure is printed as 2.15 dBi on some dealer sheets and 3.0 on others - Diamond's US site publishes no text specs to break the tie, so we flag rather than pick Radialless: the half-wave VHF element barely cares what it's mounted on - hatchbacks and trunk lips welcome Fold-over base for garages; NMO mount in black ('HB'); the NR770H family covers chrome and PL-259 variants The benchmark rival to wideband competitors - it holds a sharper match inside the ham segments while they trade for spectrum

Strengths

Forty inches of consensus: the NR770H recipe - radialless half-wave under stacked 5/8s - has been the default mid-size dual-bander for decades because it balances every variable at once. Real UHF gain, ground-plane indifference that forgives imperfect mounts, a fold-over for the garage, and the NMO base that survives vehicle after vehicle.

Weaknesses

It is the middle of every curve: the compact class clears garages it cannot, the tall class outtalks it audibly, and wideband rivals cover GMRS and public-service frequencies it does not. Purely a ham-band antenna with honest but unremarkable VHF gain.

Verdict

If someone asks 'which mobile antenna?' with no further details, this is the answer that is never wrong. Specific needs - stealth, maximum gain, out-of-band coverage - justify leaving the default; nothing else does.

Some products become the unit of measurement for their category, and Diamond's NR770H family is that for mid-size dual-band mobile whips: forty inches, a half-wave two-meter element over two phased 5/8-waves for seventy centimeters, radialless, fold-over base. The NR770HBNMO is the black, NMO-mount expression of it. The half-wave choice is the quietly important one; it makes the antenna largely indifferent to the metal (or absence of metal) beneath it, which on real vehicles with real mounting compromises is worth more than a decibel of paper gain.

The published figures are the class benchmarks other antennas advertise against, 5.5 dBi on UHF unanimously, while the VHF figure is printed as 2.15 dBi on some dealer sheets and 3.0 on others, a spread worth knowing about mostly because it shows how casually mobile-whip numbers get copied around. The wideband competition's pitch is covering GMRS and public-service spectrum the Diamond ignores; the Diamond's counter is a sharper match inside the ham segments and the serenity of the default choice. Above it, the SG7900 tall class adds genuine decibels for genuine length; below it, the NR72B compact clears the garages this one must fold for.

There is not much drama to report, which is the review: decades of production, every dealer stocked, the spec sheet every rival quotes. Defaults earn their position.

Diamond NR770HBNMO