There is no safer yield over 5% anywhere.
There are many securities that have safer yields over 5% than PTF.
Remember that PTF has many risks:
* Price of oil and natural gas
* Value of the Canadian dollar
* Depletion (if the production/unit and reserves/unit are going down by 10% every year, then what does that do to the value of PTF if all else remained constant?)
* Overpaying for acquisitions
* Dry hole drilling
* etc

You can get safer yields over 5% in:
* Many U.S. equity REITS
* Canadian equity REITS
* Canadian income trusts (the ones where the distributions are growing every year)
* U.S. Preferred stock* High quality U.S. exchange traded debt.* Pipeline master limited partnerships
* etc.
You can get high yields with a different risk profile (not necessarily better, just different) than PTF by:
* U.S. Mortgage REITS (e.g. IMH and NFI)
* Tanker stocks (e.g. FRO)
* U.S. closed end funds
* Foreign closed end funds (e.g. IAF)
* Foreign utilities (e.g. UU)
* Propane master limited partnerships (e.g FGP)
* Canadian diversified trusts (e.g. eit.un, ctd.un)
* etc

These are not recommendations, but just a reminder that there is a whole world of high yielding instruments out there.