If you intend to monitor on a fixed freq or relatively narrow frequency band, choosing an antenna which is as resonant as possible for that frequency range is a good starting point, no matter what the brand name is.
But antenna choice aside, filtering can be as important. Filtering can improve SNR by 6dB - 9dB (or more).
Typical off-the-shelf consumer type scanners/receivers, as a rule have front ends comprimised by budget and volume - both these criteria impact demodulated audio quality.
Investment in a good quality pass band filter - mounted directly to the antenna - will make a big big difference by way of removing all the trash in the air that would otherwise saturate your scanner/receiver front-end with noise.
Don't underestimate the difference a good quality pass band filter can make. My personal favorite are cavity type pass band filters - they can be obtained for as broad, or narrow a bandwidth as desired while still retaining decent shape and roll-off characteristics. never be too concerned about the signal strength loss/es that cavities incurr. The improvement in SNR they provide will always off-set signal strength loss - and anyway, scanners/receivers are nowadays as a rule plenty sensitive enough (which is no small part of the problem in that they saturate easily).