It doesn't work so well as a portable unless the antenna is free from all obstruction.

Built-in top antenna works

The antenna is too weak

Much more powerful than the little cube antenna

Utilizing it as a recorder and accomplishing that from your home dock, and external antenna at night is perfect for indoor use later.

It works great (you DO have to keep the antenna clear and pointed generally in the direction of the satellite, or buy the headphones with the antenna in the headband.

Make sure you place the antenna to assure a constant dependable solid signal from the antenna

But only for Sirius radio's (not compatible with XM-only radio's).Amazon sells this antenna for around $39

My old antenna works with the XMp3i cradle, as does the patch cord connecting the XM radio to my surround receiver.

It CAN work with out an external antenna, but I highly recommend using a dock kit with an external antenna

the antenna on top works well if you are outside or in a

Just about 3 months later this player is now broken as the front dial came off.

Just about 3 months later this player is now broken as the front dial came off.