A balise to be arranged stationary between rails of a railway track to wirelessly transmit data to at least one vehicle antenna of a railway vehicle on the railway track, said balise comprising: an essentially planar dielectric circuit substrate having a first side to be facing upwards and a second side to be facing downwards when the balise is arranged stationary between the two rails, wherein the circuit substrate has an essentially even substrate thickness, an essentially rectangular receiver loop antenna (3, 16) formed on said circuit substrate and having a receiver loop central trace along which is defined a receiver loop physical length, wherein an input flux to the receiver loop antenna is conform with a predetermined input flux in a balise active reference area, and wherein the receiver loop antenna (3, 16) is configured to receive operational energy wirelessly from a vehicle transmitter in the railway vehicle when in a vicinity of the balise, receiver circuitry connected by a receiver feed connection to said receiver loop antenna (3, 16) and configured to receive the operational energy from the receiver loop antenna, an essentially rectangular transmitter loop antenna (8, 18) formed on said circuit substrate and having a transmitter loop central trace along which is defined a transmitter loop physical length, wherein an output field from the transmitter loop antenna (8, 18) is conform with a field from a predetermined current encircling said balise active reference area and wherein the transmitter loop antenna (8, 18) is configured to transmit data wirelessly to a vehicle receiver in the railway vehicle when in a vicinity of the balise, transmitter circuitry connected by a transmitter feed connection to the transmitter loop antenna (8, 18) and configured to feed to the transmitter loop antenna a transmit signal including said data, characterized in that the receiver loop central trace and the transmitter loop central trace have a mean separation of at least two times the dielectric substrate thickness, that the receiver loop antenna (3, 16) has two, three, four or more loop segments separated by respective gaps in addition to a gap at the receiver feed connection of the receiver loop antenna, and that each one of the respective gaps is bridged by a respective capacitance so as to render an even current distribution in the receiver loop antenna (3, 16). an essentially planar dielectric circuit substrate having a first side to be facing upwards and a second side to be facing downwards when the balise is arranged stationary between the two rails, wherein the circuit substrate has an essentially even substrate thickness, an essentially rectangular receiver loop antenna (3, 16) formed on said circuit substrate and having a receiver loop central trace along which is defined a receiver loop physical length, wherein an input flux to the receiver loop antenna is conform with a predetermined input flux in a balise active reference area, and wherein the receiver loop antenna (3, 16) is configured to receive operational energy wirelessly from a vehicle transmitter in the railway vehicle when in a vicinity of the balise, receiver circuitry connected by a receiver feed connection to said receiver loop antenna (3, 16) and configured to receive the operational energy from the receiver loop antenna, an essentially rectangular transmitter loop antenna (8, 18) formed on said circuit substrate and having a transmitter loop central trace along which is defined a transmitter loop physical length, wherein an output field from the transmitter loop antenna (8, 18) is conform with a field from a predetermined current encircling said balise active reference area and wherein the transmitter loop antenna (8, 18) is configured to transmit data wirelessly to a vehicle receiver in the railway vehicle when in a vicinity of the balise, transmitter circuitry connected by a transmitter feed connection to the transmitter loop antenna (8, 18) and configured to feed to the transmitter loop antenna a transmit signal including said data, characterized in that the receiver loop central trace and the transmitter loop central trace have a mean separation of at least two times the dielectric substrate thickness, that the receiver loop antenna (3, 16) has two, three, four or more loop segments separated by respective gaps in addition to a gap at the receiver feed connection of the receiver loop antenna, and that each one of the respective gaps is bridged by a respective capacitance so as to render an even current distribution in the receiver loop antenna (3, 16).