Cyanate resin blends and radomes including them

A radome comprising a plurality of plies coupled to each other, in which at least one of the plurality of plies comprises a substrate and a cured resin blend produced from an effective amount of a cyanate monomer and an effective amount of a cyanate ester oligomer to provide a dielectric constant of less than 2.7, a glass transition temperature of at least 150° C. and a moisture absorption of less than 1.5% for the radome, wherein the monomer is a compound of formulae (I)-(IX)

• or mixtures of two or more cyanate monomers, wherein at least one of R1 and R2 is —CN and the other of R1 and R2 is selected from hydrogen, —CN, —COOH, a hydrocarbon group comprising 1 to 6 carbon atoms, a hydrocarbonyl group comprising 1 to 6 carbon atoms, a halohydrocarbon group comprising 1 to 6 carbon atoms, a halohydrocarbonyl group comprising 1 to 6 carbon atoms and phenyl, and wherein R3 and R4, when present, are independently selected from hydrogen, —CN, —COOH, a hydrocarbon group comprising 1 to 6 carbon atoms, a hydrocarbonyl group comprising 1 to 6 carbon atoms, a halohydrocarbon group comprising 1 to 6 carbon atoms, a halohydrocarbonyl group comprising 1 to 6 carbon atoms and phenyl, wherein the oligomer is not a polymerization product of a compound of formula III, a compound of formula IV, or a mixture of a compound of formula III and a compound of formula IV.