Needed to change receiver UGH !!

We are way down south outside normal reception areas. With a large antenna we got reasonable reception which we lost for an hour each day on our old sporster SP-R2R.
Sadly this crapped out and we have bought Sirius/XM XDPIV2. No reception at all on this new machine. Signal strength meter shows nothing !
I have not kept abreast of the changes when Sirius and XM got together. Do the machines have the same specs. Have we bought a replacement that just wont work down here ?
Thanks for any help
Tony

Are you using the same antenna that you used on the old SP-R2R? Is it compatible?

Yes exactly the same antenna.
Tony

Are you sure the issue isn't the antenna? Have you tried using the new one that came with the new receiver?