A method for a radio transmitter and a radio receiver in a non-line of sight communication system for evaluating a payload antenna transmit pattern of a directive payload transmit antenna and a payload antenna receive pattern of a directive payload receive antenna, the method comprising the steps of - generating a probing signal (126, 106), - steering a transmit pattern of a steerable transmit pattern antenna according to a pre-determined sequence of probing signal transmit patterns, - transmitting the probing signal via the steerable transmit pattern antenna, - steering a probing signal receive pattern of a steerable receive pattern antenna according to a pre-determined sequence of probing signal receive patterns, - receiving the probing signal via the steerable receive pattern antenna, - determining a probing signal quality value from the received probing signal as a function of the pre-determined sequence of probing signal receive patterns, - transmitting a payload signal, the transmitted payload signal being arranged to be independent of and separated from the transmitted probing signal, - receiving the payload signal, characterized in that the radio receiver is part of a radio link communication system in which a fixed amount of bandwidth is available to the communication system, the method further comprising the steps of - transmitting the payload signal via the directive payload transmit antenna in parallel with transmitting the probing signal, the directive payload transmit antenna being configured to have the payload antenna transmit pattern, - receiving the payload signal via the directive payload receive antenna in parallel with receiving the probing signal, the directive payload receive antenna having the payload antenna receive pattern, and - performing dynamic resource allocation between the payload signal and the probing signal, such that when a traffic load is at a high value, a low level of resources is used by the probing signal, while, during times when the traffic load is at a low value, the probing signal is allowed to consume a higher level of resources than the low level of resources. - generating a probing signal (126, 106), - steering a transmit pattern of a steerable transmit pattern antenna according to a pre-determined sequence of probing signal transmit patterns, - transmitting the probing signal via the steerable transmit pattern antenna, - steering a probing signal receive pattern of a steerable receive pattern antenna according to a pre-determined sequence of probing signal receive patterns, - receiving the probing signal via the steerable receive pattern antenna, - determining a probing signal quality value from the received probing signal as a function of the pre-determined sequence of probing signal receive patterns, - transmitting a payload signal, the transmitted payload signal being arranged to be independent of and separated from the transmitted probing signal, - receiving the payload signal, - transmitting the payload signal via the directive payload transmit antenna in parallel with transmitting the probing signal, the directive payload transmit antenna being configured to have the payload antenna transmit pattern, - receiving the payload signal via the directive payload receive antenna in parallel with receiving the probing signal, the directive payload receive antenna having the payload antenna receive pattern, and - performing dynamic resource allocation between the payload signal and the probing signal, such that when a traffic load is at a high value, a low level of resources is used by the probing signal, while, during times when the traffic load is at a low value, the probing signal is allowed to consume a higher level of resources than the low level of resources.