Because the loop is tightly tuned to a particular frequency, it requires retuning for even relatively small frequency changes, even though it can operate on many different frequencies.

Magnetic loop antennas are great if you are limited on space since they are just a potentially small loop of wire. The problem is, they are sharply tuned. You normally have an adjustment capacitor ...

Antenna Types and Their Features The following common antennas are covered in detail in this section: half-wave dipole, quarter wave monopole, transversal mode helical, and small loop antennas.