RF Explorer is a handheld digital spectrum analyzer covering 15 MHz to 2.7 GHz. It is based on a highly integrated frequency synthesizer and double balanced mixer which offers high performance, compact size, low consumption and low cost. I’ve been beta-testing the unit for some time now and can confirm it works well as an affordable general-purpose analyzer.
Being battery-operated (chargeable via USB), it makes a great EMC troubleshooting tool. Probably, the major disadvantage is the limited user interface, being just seven push buttons, but there is available freeware PC and Mac remote client software to run and display waveforms. The display is also limited in resolution, but for the price, it’s tough to complain too much!
To read a review of the older model, which is very similar, click here…
The new RF Explorer is available now through SeeedStudio for $269.
design-4-emc.com 
I read an article written by you about the RF Explorer in which you have shown a photograph;
Here the antenna is used like a near field probe. Since I am new to EMI trouble shooting and planning to buy RF Explorer 3G Combo,would like to ask whether we really can use the rf explorer’s antenna like a near field probe over the entire range of frequency.
The supplied antenna can also work as a near field probe, but the spatial resolution may not be sufficient to narrow down noise currents to a specific circuit trace. For that purpose, it is better to use a small H-field or E-field probe.
I find that a 2 cm diameter H-field probe is good for general location of harmonic sources, while a much smaller 2-3 mm diameter probe is best for tracing harmonics to specific traces.
I’ve written many other articles on the use of the RF Explorer and troubleshooting EMI issues. Check my web site at http://www.emc-seminars.com for links to my two blogs, as well as links to several magazine articles on EMC troubleshooting, construction of near field probes and assembling your own EMC troubleshooting kit.