The Omni antenna is a perfect addition to any RF device, including RF detectors, spectrum analyzers, receivers, etc. Typical antenna supplied with a near-field RF detector receives higher frequencies quite well but might be weak at lower bands. The Omni antenna will improve the sensitivity and detecting distance in the entire range (80-4000 MHz) but the most significant increase of performance will be observed within 80-700 MHz. Such improvement is particularly important when detecting or receiving signals operating on VHF, UHF and ISM 315 & 433 MHz bands.
When you need more range-