Is an RF (radio frequency) transmission system better than an IR (infrared) system?
The sound quality is no different. You have freedom of movement with RF transmission, i.e. you can listen to sound outside of the 4 walls that surround your TV or radio. However; there is a greater risk of interference with an RF system from other similar systems. In the UK there are only 3 discrete radio frequencies available for this type of equipment (with some products only using 2 of the 3). This means that it is likely that you could pick up a signal from similar “cordless” headphones etc. being used by someone else in the same house your a near neighbour (given that the signal travels up to 100 feet).