Outside antenna for HD radio?

[Don Wiss <donwiss@xxxxxxxxxxx>]

I was looking at the Boston Acoustics HD radio. For an antenna it comes
with a 7-foot dipole.

http://www.bostonacoustics.com/home_product.aspx?product_id=325

Now I thought FM used a 5-foot dipole. And what if I don't want a wire on
my wall, and I'd rather have something on the roof? What outside antennas
are there for HD radio? What sort of wire to bring the signal inside?

Don <www.donwiss.com> (e-mail link at home page bottom).