A portable radio device comprising an antenna apparatus, said antenna apparatus comprising: a substrate; a closed rectangular structure comprising first, second, third and fourth side loop strips disposed upon said substrate, the first and second side loop strips of said rectangular structure extending in a first polarization direction and the third and fourth side loop strips extending in a second polarization direction, wherein the first to fourth side loop strips are configured such that adjacent ones of the loop strips abut against one another in electrical connection therebetween, and wherein said third side loop strip includes a third side loop strip portion extending a length from said first side loop strip and said fourth side loop strip includes a fourth side loop strip portion extending said length from said second side loop strip; a plurality of shared loop strips disposed upon said substrate, the loop strips of said plurality of shared loop strips disposed within the perimeter of said closed rectangular structure including: a first shared strip extending in said first polarization direction and having a first end direct-current coupled to said third side loop strip portion at said length from the first side loop strip, a second shared strip extending in said first polarization direction and having a first end direct-current coupled to said fourth side loop strip portion at said length from the first side loop strip, and a third shared strip having said length, extending in said second polarization direction, and direct-current coupled to a second end of said first shared strip and coupled to a second end of said second shared strip, wherein said side and shared loop strips define two antenna loops (46, 48) point symmetrical with respect to the centre of said closed rectangular structure; and a single feed connection coupled to said third shared strip at a feed point disposed midway between said second end of said first shared strip and said second end of said second shared strip to provide simultaneous symmetrical excitation of the antenna loops. a substrate; a closed rectangular structure comprising first, second, third and fourth side loop strips disposed upon said substrate, the first and second side loop strips of said rectangular structure extending in a first polarization direction and the third and fourth side loop strips extending in a second polarization direction, wherein the first to fourth side loop strips are configured such that adjacent ones of the loop strips abut against one another in electrical connection therebetween, and wherein said third side loop strip includes a third side loop strip portion extending a length from said first side loop strip and said fourth side loop strip includes a fourth side loop strip portion extending said length from said second side loop strip; a plurality of shared loop strips disposed upon said substrate, the loop strips of said plurality of shared loop strips disposed within the perimeter of said closed rectangular structure including: a first shared strip extending in said first polarization direction and having a first end direct-current coupled to said third side loop strip portion at said length from the first side loop strip, a second shared strip extending in said first polarization direction and having a first end direct-current coupled to said fourth side loop strip portion at said length from the first side loop strip, and a third shared strip having said length, extending in said second polarization direction, and direct-current coupled to a second end of said first shared strip and coupled to a second end of said second shared strip, a first shared strip extending in said first polarization direction and having a first end direct-current coupled to said third side loop strip portion at said length from the first side loop strip, a second shared strip extending in said first polarization direction and having a first end direct-current coupled to said fourth side loop strip portion at said length from the first side loop strip, and a third shared strip having said length, extending in said second polarization direction, and direct-current coupled to a second end of said first shared strip and coupled to a second end of said second shared strip, wherein said side and shared loop strips define two antenna loops (46, 48) point symmetrical with respect to the centre of said closed rectangular structure; and a single feed connection coupled to said third shared strip at a feed point disposed midway between said second end of said first shared strip and said second end of said second shared strip to provide simultaneous symmetrical excitation of the antenna loops.