A method in a channel handling node (400, 604) associated with a white space database, for balancing load on available channels for secondary usage by secondary network nodes of a secondary network (404, 602) for radio communication in a specific geographical area, wherein the channel handling node (400, 604) returns information about the available channels in response to channel queries from the secondary network nodes of the secondary network (404, 602), the method comprising: - determining values of a channel quality metric for the available channels, the values indicating expected utility when the available channels are used for the radio communication in the specific geographical area, characterized in that the method further comprises: - adjusting a determined channel quality metric value of at least one superior channel having a channel quality metric value that indicates the highest expected utility, which is higher than an expected utility indicated by channel quality metric values of other available channels, to indicate equal or lower expected utility of the at least one superior channel than a channel of the other available channels having the next highest expected utility, when an amount of the channel queries received from the secondary network nodes of the secondary network (404, 602) during a given time span exceeds a first limit, and - returning the adjusted channel quality metric value of the at least one superior channel, in response to at least one subsequent channel query from at least one secondary network node of the secondary network (404, 602), wherein an indicator is returned to said at least one secondary network node of the secondary network with the adjusted channel metric value to indicate that the channel quality metric value of the at least one superior channel has been adjusted, thereby influencing said at least one secondary network node of the secondary network (404, 602) to select a channel other than the at least one superior channel for the radio communication to balance the load on the available channels. - determining values of a channel quality metric for the available channels, the values indicating expected utility when the available channels are used for the radio communication in the specific geographical area, - adjusting a determined channel quality metric value of at least one superior channel having a channel quality metric value that indicates the highest expected utility, which is higher than an expected utility indicated by channel quality metric values of other available channels, to indicate equal or lower expected utility of the at least one superior channel than a channel of the other available channels having the next highest expected utility, when an amount of the channel queries received from the secondary network nodes of the secondary network (404, 602) during a given time span exceeds a first limit, and - returning the adjusted channel quality metric value of the at least one superior channel, in response to at least one subsequent channel query from at least one secondary network node of the secondary network (404, 602), wherein an indicator is returned to said at least one secondary network node of the secondary network with the adjusted channel metric value to indicate that the channel quality metric value of the at least one superior channel has been adjusted, thereby influencing said at least one secondary network node of the secondary network (404, 602) to select a channel other than the at least one superior channel for the radio communication to balance the load on the available channels.